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Zeilstra D, Younes JA, Brummer RJ, Kleerebezem M. Perspective: Fundamental Limitations of the Randomized Controlled Trial Method in Nutritional Research: The Example of Probiotics. Adv Nutr 2018; 9:561-571. [PMID: 30124741 PMCID: PMC6140446 DOI: 10.1093/advances/nmy046] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 05/14/2018] [Accepted: 06/08/2018] [Indexed: 12/13/2022] Open
Abstract
Studies on the relation between health and nutrition are often inconclusive. There are concerns about the validity of many research findings, and methods that can deliver high-quality evidence-such as the randomized controlled trial (RCT) method-have been embraced by nutritional researchers. Unfortunately, many nutritional RCTs also yield ambiguous results. It has been argued that RCTs are ill-suited for certain settings, including nutritional research. In this perspective, we investigate whether there are fundamental limitations of the RCT method in nutritional research. To this end, and to limit the scope, we use probiotic studies as an example. We use an epistemological approach and evaluate the presuppositions that underlie the RCT method. Three general presuppositions are identified and discussed. We evaluate whether these presuppositions can be considered true in probiotic RCTs, which appears not always to be the case. This perspective concludes by exploring several alternative study methods that may be considered for future probiotic or nutritional intervention trials.
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Affiliation(s)
| | | | - Robert J Brummer
- Nutrition-Gut-Brain Interactions Research Centre, Faculty of Health and Medicine, School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Michiel Kleerebezem
- Host Microbe Interactomics Group, Wageningen University, Wageningen, The Netherlands
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202
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Bechthold A, Boeing H, Tetens I, Schwingshackl L, Nöthlings U. Perspective: Food-Based Dietary Guidelines in Europe-Scientific Concepts, Current Status, and Perspectives. Adv Nutr 2018; 9:544-560. [PMID: 30107475 PMCID: PMC6140433 DOI: 10.1093/advances/nmy033] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 04/24/2018] [Accepted: 05/05/2018] [Indexed: 01/01/2023] Open
Abstract
Food-based dietary guidelines (FBDGs) are important tools for nutrition policies and public health. FBDGs provide guidelines on healthy food consumption and are based on scientific evidence. In the past, disease prevention and nutrient recommendations dominated the process of establishing FBDGs. However, scientific advances and social developments such as changing lifestyles, interest in personalized health, and concerns about sustainability require a reorientation of the creation of FBDGs to include a wider range of aspects of dietary behavior. The present review evaluates current European FBDGs with regard to the concepts and aspects used in their derivation, and summarizes the major aspects currently discussed to be considered in future establishment or updates of FBDGs. We identified English information on official European FBDGs through an Internet search (FAO, PubMed, Google) and analyzed the aspects used for their derivation. Furthermore, we searched literature databases (PubMed, Google Scholar) for conceptional considerations dealing with FBDGs. A total of 34 out of 53 European countries were identified as having official FBDGs, and for 15 of these, documents with information on the scientific basis could be identified and described. Subsequently, aspects underlying the derivation of current FBDGs and aspects considered in the literature as important for future FBDGs were discussed. Eight aspects were identified: diet-health relations, nutrient supply, energy supply, dietary habits, sustainability, food-borne contaminants, target group segmentation, and individualization. The first 4 have already been widely applied in existing FBDGs; the others have almost never been taken into account. It remains a future challenge to (re)conceptionalize the development of FBDGs, to operationalize the aspects to be incorporated in their derivation, and to convert concepts into systematic approaches. The current review may assist national expert groups and clarifies the options for future development of local FBDGs.
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Affiliation(s)
| | - Heiner Boeing
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Inge Tetens
- Vitality–Center for Good Older Lives, Department of Nutrition, Exercise, and Sports, University of Copenhagen, Frederiksberg C, Denmark
| | - Lukas Schwingshackl
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Ute Nöthlings
- Department of Nutrition and Food Sciences, Nutritional Epidemiology, University of Bonn, Bonn, Germany
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203
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Schwingshackl L, Hoffmann G, Iqbal K, Schwedhelm C, Boeing H. Food groups and intermediate disease markers: a systematic review and network meta-analysis of randomized trials. Am J Clin Nutr 2018; 108:576-586. [PMID: 30535089 PMCID: PMC6134288 DOI: 10.1093/ajcn/nqy151] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 06/13/2018] [Indexed: 12/12/2022] Open
Abstract
Background In previous meta-analyses of prospective observational studies, we investigated the association between food groups and risk of chronic disease. Objective The aim of the present network meta-analysis (NMA) was to assess the effects of these food groups on intermediate-disease markers across randomized intervention trials. Design Literature searches were performed until January 2018. The following inclusion criteria were defined a priori: 1) randomized trial (≥4 wk duration) comparing ≥2 of the following food groups: refined grains, whole grains, nuts, legumes, fruits and vegetables, eggs, dairy, fish, red meat, and sugar-sweetened beverages (SSBs); 2) LDL cholesterol and triacylglycerol (TG) were defined as primary outcomes; total cholesterol, HDL cholesterol, fasting glucose, glycated hemoglobin, homeostasis model assessment insulin resistance, systolic and diastolic blood pressure, and C-reactive protein were defined as secondary outcomes. For each outcome, a random NMA was performed, and for the ranking, the surface under the cumulative ranking curves (SUCRA) was determined. Results A total of 66 randomized trials (86 reports) comparing 10 food groups and enrolling 3595 participants was identified. Nuts were ranked as the best food group at reducing LDL cholesterol (SUCRA: 93%), followed by legumes (85%) and whole grains (70%). For reducing TG, fish (97%) was ranked best, followed by nuts (78%) and red meat (72%). However, these findings are limited by the low quality of the evidence. When combining all 10 outcomes, the highest SUCRA values were found for nuts (66%), legumes (62%), and whole grains (62%), whereas SSBs performed worst (29%). Conclusion The present NMA provides evidence that increased intake of nuts, legumes, and whole grains is more effective at improving metabolic health than other food groups. For the credibility of diet-disease relations, high-quality randomized trials focusing on well-established intermediate-disease markers could play an important role. This systematic review was registered at PROSPERO (www.crd.york.ac.uk/PROSPERO) as CRD42018086753.
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Affiliation(s)
- Lukas Schwingshackl
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE)
, Nuthetal, Germany,NutriAct – Competence Cluster Nutrition Research Berlin-Potsdam, Germany,Address correspondence to LS (e-mail: )
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Vienna, Austria
| | - Khalid Iqbal
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE)
, Nuthetal, Germany
| | - Carolina Schwedhelm
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE)
, Nuthetal, Germany,NutriAct – Competence Cluster Nutrition Research Berlin-Potsdam, Germany
| | - Heiner Boeing
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE)
, Nuthetal, Germany,NutriAct – Competence Cluster Nutrition Research Berlin-Potsdam, Germany
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204
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Dietary calcium intake and hypertension risk: a dose-response meta-analysis of prospective cohort studies. Eur J Clin Nutr 2018; 73:969-978. [PMID: 30097650 DOI: 10.1038/s41430-018-0275-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 07/06/2018] [Indexed: 11/08/2022]
Abstract
The association of calcium intake with risk of developing hypertension in the general population has not been established yet. We systematically searched PubMed and Scopus databases up to February 2018 to find prospective observational studies investigating the association of calcium intake with risk of developing hypertension. The reported risk estimates were pooled using a random-effects model. Eight prospective cohort studies (248,398 participants and 30,838 cases) were included. Seven studies measured dietary calcium intake, but one study measured total calcium intake (calcium from food and supplements). A significant inverse association was found for the highest versus lowest category of calcium intake (relative risk: 0.89, 95%CI: 0.86, 0.93; I2 = 0%, n = 8), and for each 500 mg/d increment (relative risk: 0.93, 95%CI: 0.90, 0.97; I2 = 64%, n = 7). Summary results were the same with the main analyses when the analyses were restricted only to dietary calcium intake. A nonlinear dose-response meta-analysis exhibited a linear inverse association, with a somewhat steeper trend within the low and moderate intakes. In conclusion, higher dietary calcium intake, independent of adiposity and intake of other blood pressure-related minerals, is slightly associated with a lower risk of developing hypertension.
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205
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Galbete C, Schwingshackl L, Schwedhelm C, Boeing H, Schulze MB. Evaluating Mediterranean diet and risk of chronic disease in cohort studies: an umbrella review of meta-analyses. Eur J Epidemiol 2018; 33:909-931. [PMID: 30030684 PMCID: PMC6153506 DOI: 10.1007/s10654-018-0427-3] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 07/17/2018] [Indexed: 12/11/2022]
Abstract
Several meta-analyses have been published summarizing the associations of the Mediterranean diet (MedDiet) with chronic diseases. We evaluated the quality and credibility of evidence from these meta-analyses as well as characterized the different indices used to define MedDiet and re-calculated the associations with the different indices identified. We conducted an umbrella review of meta-analyses on cohort studies evaluating the association of the MedDiet with type 2 diabetes, cardiovascular disease, cancer and cognitive-related diseases. We used the AMSTAR (A MeaSurement Tool to Assess systematic Reviews) checklist to evaluate the methodological quality of the meta-analyses, and the NutriGrade scoring system to evaluate the credibility of evidence. We also identified different indices used to define MedDiet; tests for subgroup differences were performed to compare the associations with the different indices when at least 2 studies were available for different definitions. Fourteen publications were identified and within them 27 meta-analyses which were based on 70 primary studies. Almost all meta-analyses reported inverse associations between MedDiet and risk of chronic disease, but the credibility of evidence was rated low to moderate. Moreover, substantial heterogeneity was observed on the use of the indices assessing adherence to the MedDiet, but two indices were the most used ones [Trichopoulou MedDiet (tMedDiet) and alternative MedDiet (aMedDiet)]. Overall, we observed little difference in risk associations comparing different MedDiet indices in the subgroup meta-analyses. Future prospective cohort studies are advised to use more homogenous definitions of the MedDiet to improve the comparability across meta-analyses.
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Affiliation(s)
- Cecilia Galbete
- Department of Molecular Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany.,NutriAct - Competence Cluster Nutrition Research Berlin-Potsdam, Nuthetal, Germany
| | - Lukas Schwingshackl
- NutriAct - Competence Cluster Nutrition Research Berlin-Potsdam, Nuthetal, Germany. .,Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany.
| | - Carolina Schwedhelm
- NutriAct - Competence Cluster Nutrition Research Berlin-Potsdam, Nuthetal, Germany.,Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Heiner Boeing
- NutriAct - Competence Cluster Nutrition Research Berlin-Potsdam, Nuthetal, Germany.,Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Matthias B Schulze
- Department of Molecular Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany.,NutriAct - Competence Cluster Nutrition Research Berlin-Potsdam, Nuthetal, Germany.,Institute of Nutritional Sciences, University of Potsdam, Nuthetal, Germany
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206
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Schwingshackl L, Schwedhelm C, Hoffmann G, Boeing H. Potatoes and risk of chronic disease: a systematic review and dose-response meta-analysis. Eur J Nutr 2018; 58:2243-2251. [PMID: 29987352 PMCID: PMC6689281 DOI: 10.1007/s00394-018-1774-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 07/06/2018] [Indexed: 12/17/2022]
Abstract
Purpose We aimed to synthesize the evidence on the relation between different types of potato consumption with risk of all-cause mortality, coronary heart disease (CHD), stroke, type 2 diabetes (T2D), colorectal cancer (CRC), and hypertension. Methods Systematic searches until May 2018 were conducted in PubMed, Scopus, and Web of Science. Random effects meta-analyses comparing extreme categories, linear and non-linear dose–response analyses were conducted. Results Twenty-eight reports were identified. Only total potato consumption was available for some endpoints which showed no associations with all-cause mortality (RR: 0.88, 95% CI 0.69–1.12), CHD (RR: 1.03, 95% CI 0.96–1.09), stroke (RR: 0.98, 95% CI 0.93–1.03), and CRC (RR: 1.05, 95% CI 0.92–1.20) per one daily/serving (150 g/day) increase. Consumption of one daily serving of boiled/baked/mashed-potatoes was not associated with risk of hypertension (RR: 1.08, 95% CI 0.96–1.21), but slightly with the risk of T2D (RR: 1.09, 95% 1.01–1.18). Positive associations for the risk of T2D (RR: 1.66, 95% CI 1.43–1.94) and hypertension (RR: 1.37, 95% CI 1.15–1.63) were observed for each 150 g/day increase in French-fries consumption. The quality of evidence was rated mostly low (moderate quality of evidence for the risk-associations of French-fries). Conclusion Total potato consumption is not related to risk for many chronic diseases but could pose a small increase in risk for T2D if consumed boiled. A clear risk relation was found between French-fries consumption and risk of T2D and hypertension. For several outcomes, the impact of different preparation procedures could not be assessed. Electronic supplementary material The online version of this article (10.1007/s00394-018-1774-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lukas Schwingshackl
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany. .,NutriAct-Competence Cluster Nutrition Research Berlin-Potsdam, Berlin, Germany.
| | - Carolina Schwedhelm
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany.,NutriAct-Competence Cluster Nutrition Research Berlin-Potsdam, Berlin, Germany
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Althanstrasse 14, UZA II, 1090, Vienna, Austria
| | - Heiner Boeing
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany.,NutriAct-Competence Cluster Nutrition Research Berlin-Potsdam, Berlin, Germany
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207
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Trepanowski JF, Ioannidis JPA. Perspective: Limiting Dependence on Nonrandomized Studies and Improving Randomized Trials in Human Nutrition Research: Why and How. Adv Nutr 2018; 9:367-377. [PMID: 30032218 PMCID: PMC6054237 DOI: 10.1093/advances/nmy014] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
A large majority of human nutrition research uses nonrandomized observational designs, but this has led to little reliable progress. This is mostly due to many epistemologic problems, the most important of which are as follows: difficulty detecting small (or even tiny) effect sizes reliably for nutritional risk factors and nutrition-related interventions; difficulty properly accounting for massive confounding among many nutrients, clinical outcomes, and other variables; difficulty measuring diet accurately; and suboptimal research reporting. Tiny effect sizes and massive confounding are largely unfixable problems that narrowly confine the scenarios in which nonrandomized observational research is useful. Although nonrandomized studies and randomized trials have different priorities (assessment of long-term causality compared with assessment of treatment effects), the odds for obtaining reliable information with the former are limited. Randomized study designs should therefore largely replace nonrandomized studies in human nutrition research going forward. To achieve this, many of the limitations that have traditionally plagued most randomized trials in nutrition, such as small sample size, short length of follow-up, high cost, and selective reporting, among others, must be overcome. Pivotal megatrials with tens of thousands of participants and lifelong follow-up are possible in nutrition science with proper streamlining of operational costs. Fixable problems that have undermined observational research, such as dietary measurement error and selective reporting, need to be addressed in randomized trials. For focused questions in which dietary adherence is important to maximize, trials with direct observation of participants in experimental in-house settings may offer clean answers on short-term metabolic outcomes. Other study designs of randomized trials to consider in nutrition include registry-based designs and "N-of-1" designs. Mendelian randomization designs may also offer some more reliable leads for testing interventions in trials. Collectively, an improved randomized agenda may clarify many things in nutrition science that might never be answered credibly with nonrandomized observational designs.
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Affiliation(s)
| | - John P A Ioannidis
- Stanford Prevention Research Center
- Meta-Research Innovation Center at Stanford (METRICS)
- Departments of Medicine, Stanford University, Stanford, CA
- Departments of Health Research and Policy, Stanford University, Stanford, CA
- Departments of Biomedical Data Science, Stanford University, Stanford, CA
- Departments of Statistics, Stanford University, Stanford, CA
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208
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Effect of Dietary Sugar Intake on Biomarkers of Subclinical Inflammation: A Systematic Review and Meta-Analysis of Intervention Studies. Nutrients 2018; 10:nu10050606. [PMID: 29757229 PMCID: PMC5986486 DOI: 10.3390/nu10050606] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/05/2018] [Accepted: 05/09/2018] [Indexed: 12/29/2022] Open
Abstract
It has been postulated that dietary sugar consumption contributes to increased inflammatory processes in humans, and that this may be specific to fructose (alone, in sucrose or in high-fructose corn syrup (HFCS)). Therefore, we conducted a meta-analysis and systematic literature review to evaluate the relevance of fructose, sucrose, HFCS, and glucose consumption for systemic levels of biomarkers of subclinical inflammation. MEDLINE, EMBASE, and Cochrane libraries were searched for controlled intervention studies that report the effects of dietary sugar intake on (hs)CRP, IL-6, IL-18, IL-1RA, TNF-α, MCP-1, sICAM-1, sE-selectin, or adiponectin. Included studies were conducted on adults or adolescents with ≥20 participants and ≥2 weeks duration. Thirteen studies investigating 1141 participants were included in the meta-analysis. Sufficient studies (≥3) to pool were only available for (hs)CRP. Using a random effects model, pooled effects of the interventions (investigated as mean difference (MD)) revealed no differences in (hs)CRP between fructose intervention and glucose control groups (MD: −0.03 mg/L (95% CI: −0.52, 0.46), I² = 44%). Similarly, no differences were observed between HFCS and sucrose interventions (MD: 0.21 mg/L (−0.11, 0.53), I² = 0%). The quality of evidence was evaluated using Nutrigrade, and was rated low for these two comparisons. The limited evidence available to date does not support the hypothesis that dietary fructose, as found alone or in HFCS, contributes more to subclinical inflammation than other dietary sugars.
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209
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Generating the evidence for risk reduction: a contribution to the future of food-based dietary guidelines. Proc Nutr Soc 2018; 77:432-444. [PMID: 29708078 DOI: 10.1017/s0029665118000125] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A major advantage of analyses on the food group level is that the results are better interpretable compared with nutrients or complex dietary patterns. Such results are also easier to transfer into recommendations on primary prevention of non-communicable diseases. As a consequence, food-based dietary guidelines (FBDG) are now the preferred approach to guide the population regarding their dietary habits. However, such guidelines should be based on a high grade of evidence as requested in many other areas of public health practice. The most straightforward approach to generate evidence is meta-analysing published data based on a careful definition of the research question. Explicit definitions of study questions should include participants, interventions/exposure, comparisons, outcomes and study design. Such type of meta-analyses should not only focus on categorical comparisons, but also on linear and non-linear dose-response associations. Risk of bias of the individual studies of the meta-analysis should be assessed, rated and the overall credibility of the results scored (e.g. using NutriGrade). Tools such as a measurement tool to assess systematic reviews or ROBIS are available to evaluate the methodological quality/risk of bias of meta-analyses. To further evaluate the complete picture of evidence, we propose conducting network meta-analyses (NMA) of intervention trials, mostly on intermediate disease markers. To rank food groups according to their impact, disability-adjusted life years can be used for the various clinical outcomes and the overall results can be compared across the food groups. For future FBDG, we recommend to implement evidence from pairwise and NMA and to quantify the health impact of diet-disease relationships.
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210
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Soltani S, Chitsazi MJ, Salehi-Abargouei A. The effect of dietary approaches to stop hypertension (DASH) on serum inflammatory markers: A systematic review and meta-analysis of randomized trials. Clin Nutr 2018; 37:542-550. [DOI: 10.1016/j.clnu.2017.02.018] [Citation(s) in RCA: 108] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 02/10/2017] [Accepted: 02/17/2017] [Indexed: 01/15/2023]
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211
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Schwingshackl L, Schwedhelm C, Hoffmann G, Knüppel S, Laure Preterre A, Iqbal K, Bechthold A, De Henauw S, Michels N, Devleesschauwer B, Boeing H, Schlesinger S. Food groups and risk of colorectal cancer. Int J Cancer 2017; 142:1748-1758. [DOI: 10.1002/ijc.31198] [Citation(s) in RCA: 136] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 10/19/2017] [Accepted: 11/21/2017] [Indexed: 01/06/2023]
Affiliation(s)
- Lukas Schwingshackl
- Department of Epidemiology; German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116; Nuthetal 14558 Germany
| | - Carolina Schwedhelm
- Department of Epidemiology; German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116; Nuthetal 14558 Germany
| | - Georg Hoffmann
- Department of Nutritional Sciences; University of Vienna, Althanstraße 14, UZA II; Vienna 1090 Austria
| | - Sven Knüppel
- Department of Epidemiology; German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116; Nuthetal 14558 Germany
| | - Anne Laure Preterre
- Department of Epidemiology; German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116; Nuthetal 14558 Germany
| | - Khalid Iqbal
- Department of Epidemiology; German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116; Nuthetal 14558 Germany
| | - Angela Bechthold
- German Nutrition Society, Godesberger Allee 18; Bonn 53175 Germany
| | | | - Nathalie Michels
- Department of Public Health; Ghent University; Gent 9000 Belgium
| | - Brecht Devleesschauwer
- Department of Public Health and Surveillance; Scientific Institute of Public Health (WIV-ISP), Rue Juliette Wytsmanstraat 14; Brussels 1050 Belgium
| | - Heiner Boeing
- Department of Epidemiology; German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116; Nuthetal 14558 Germany
| | - Sabrina Schlesinger
- Institute for Biometry and Epidemiology, German Diabetes Center, Leibniz Institute for Diabetes Research at the Heinrich-Heine-University Düsseldorf; Düsseldorf D-40225 Germany
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212
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Bechthold A, Boeing H, Schwedhelm C, Hoffmann G, Knüppel S, Iqbal K, De Henauw S, Michels N, Devleesschauwer B, Schlesinger S, Schwingshackl L. Food groups and risk of coronary heart disease, stroke and heart failure: A systematic review and dose-response meta-analysis of prospective studies. Crit Rev Food Sci Nutr 2017; 59:1071-1090. [PMID: 29039970 DOI: 10.1080/10408398.2017.1392288] [Citation(s) in RCA: 349] [Impact Index Per Article: 49.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Despite growing evidence for food-based dietary patterns' potential to reduce cardiovascular disease risk, knowledge about the amounts of food associated with the greatest change in risk of specific cardiovascular outcomes and about the quality of meta-evidence is limited. Therefore, the aim of this meta-analysis was to synthesize the knowledge about the relation between intake of 12 major food groups (whole grains, refined grains, vegetables, fruits, nuts, legumes, eggs, dairy, fish, red meat, processed meat, and sugar-sweetened beverages [SSB]) and the risk of coronary heart disease (CHD), stroke and heart failure (HF). METHODS We conducted a systematic search in PubMed and Embase up to March 2017 for prospective studies. Summary risk ratios (RRs) and 95% confidence intervals (95% CI) were estimated using a random effects model for highest versus lowest intake categories, as well as for linear and non-linear relationships. RESULTS Overall, 123 reports were included in the meta-analyses. An inverse association was present for whole grains (RRCHD: 0.95 (95% CI: 0.92-0.98), RRHF: 0.96 (0.95-0.97)), vegetables and fruits (RRCHD: 0.97 (0.96-0.99), and 0.94 (0.90-0.97); RRstroke: 0.92 (0.86-0.98), and 0.90 (0.84-0.97)), nuts (RRCHD: 0.67 (0.43-1.05)), and fish consumption (RRCHD: 0.88 (0.79-0.99), RRstroke: 0.86 (0.75-0.99), and RRHF: 0.80 (0.67-0.95)), while a positive association was present for egg (RRHF: 1.16 (1.03-1.31)), red meat (RRCHD: 1.15 (1.08-1.23), RRstroke: 1.12 (1.06-1.17), RRHF: 1.08 (1.02-1.14)), processed meat (RRCHD: 1.27 (1.09-1.49), RRstroke: 1.17 (1.02-1.34), RRHF: 1.12 (1.05-1.19)), and SSB consumption (RRCHD: 1.17 (1.11-1.23), RRstroke: 1.07 (1.02-1.12), RRHF: 1.08 (1.05-1.12)) in the linear dose-response meta-analysis. There were clear indications for non-linear dose-response relationships between whole grains, fruits, nuts, dairy, and red meat and CHD. CONCLUSION An optimal intake of whole grains, vegetables, fruits, nuts, legumes, dairy, fish, red and processed meat, eggs and SSB showed an important lower risk of CHD, stroke, and HF.
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Affiliation(s)
| | - Heiner Boeing
- b Department of Epidemiology , German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE) , Nuthetal , Germany
| | - Carolina Schwedhelm
- b Department of Epidemiology , German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE) , Nuthetal , Germany
| | - Georg Hoffmann
- c Department of Nutritional Sciences , University of Vienna , Vienna , Austria
| | - Sven Knüppel
- b Department of Epidemiology , German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE) , Nuthetal , Germany
| | - Khalid Iqbal
- b Department of Epidemiology , German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE) , Nuthetal , Germany
| | | | - Nathalie Michels
- d Department of Public Health , Ghent University , Gent , Belgium
| | - Brecht Devleesschauwer
- e Department of Public Health and Surveillance , Scientific Institute of Public Health (WIV-ISP) , Brussels , Belgium
| | - Sabrina Schlesinger
- f Institute for Biometry and Epidemiology, Deutsches Diabetes-Zentrum (DDZ) at Heinrich Heine University Düsseldorf , Düsseldorf , Germany
| | - Lukas Schwingshackl
- b Department of Epidemiology , German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE) , Nuthetal , Germany
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Schwingshackl L, Schwedhelm C, Hoffmann G, Knüppel S, Iqbal K, Andriolo V, Bechthold A, Schlesinger S, Boeing H. Food Groups and Risk of Hypertension: A Systematic Review and Dose-Response Meta-Analysis of Prospective Studies. Adv Nutr 2017; 8:793-803. [PMID: 29141965 PMCID: PMC5683007 DOI: 10.3945/an.117.017178] [Citation(s) in RCA: 220] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The aim of this systematic review and meta-analysis was to summarize the evidence on the relation of the intakes of 12 major food groups, including whole grains, refined grains, vegetables, fruits, nuts, legumes, eggs, dairy, fish, red meat, processed meat, and sugar-sweetened beverages (SSBs) with the risk of hypertension. PubMed, Scopus, and Web of Science were searched systematically until June 2017 for prospective studies having quantitatively investigated the above-mentioned foods. We conducted meta-analysis on the highest compared with the lowest intake categories and linear and nonlinear dose-response meta-analyses to analyze the association. Summary RRs and 95% CIs were estimated by using a random-effects model. Overall, 28 reports were included in the meta-analysis. An inverse association for the risk of hypertension was observed for 30 g whole grains/d (RR: 0.92; 95% CI: 0.87, 0.98), 100 g fruits/d (RR: 0.97; 95% CI: 0.96, 0.99), 28 g nuts/d (RR: 0.70; 95% CI: 0.45, 1.08), and 200 g dairy/d (RR: 0.95; 95% CI: 0.94, 0.97), whereas a positive association for 100 g red meat/d (RR: 1.14; 95% CI: 1.02, 1.28), 50 g processed meat/d (RR: 1.12; 95% CI: 1.00, 1.26), and 250 mL SSB/d (RR: 1.07; 95% CI: 1.04, 1.10) was seen in the linear dose-response meta-analysis. Indication for nonlinear relations of the intakes of whole grains, fruits, fish, and processed meats with the risk of hypertension was detected. In summary, this comprehensive dose-response meta-analysis of 28 reports identified optimal intakes of whole grains, fruits, nuts, legumes, dairy, red and processed meats, and SSBs related to the risk of hypertension. These findings need to be seen under the light of very-low to low quality of meta-evidence. However, the findings support the current dietary guidelines in the prevention of hypertension.
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Affiliation(s)
- Lukas Schwingshackl
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Carolina Schwedhelm
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Vienna, Austria
| | - Sven Knüppel
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Khalid Iqbal
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Violetta Andriolo
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | | | - Sabrina Schlesinger
- Institute for Biometry and Epidemiology, German Diabetes Center at Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Heiner Boeing
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
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214
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Schwingshackl L, Knüppel S, Schwedhelm C, Hoffmann G, Missbach B, Stelmach-Mardas M, Dietrich S, Eichelmann F, Kontopantelis E, Iqbal K, Aleksandrova K, Lorkowski S, Leitzmann MF, Kroke A, Boeing H. Reply to JJ Meerpohl et al. Adv Nutr 2017; 8:790-791. [PMID: 28916580 PMCID: PMC5593114 DOI: 10.3945/an.117.016469] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Lukas Schwingshackl
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Sven Knüppel
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Carolina Schwedhelm
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Vienna, Austria
| | - Benjamin Missbach
- Department of Nutritional Sciences, University of Vienna, Vienna, Austria
| | - Marta Stelmach-Mardas
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Stefan Dietrich
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Fabian Eichelmann
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Evangelos Kontopantelis
- Centre for Primary Care, Institute of Population Health, University of Manchester, Manchester, United Kingdom
| | - Khalid Iqbal
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Krasimira Aleksandrova
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
| | - Stefan Lorkowski
- Institute of Nutrition, Friedrich Schiller University Jena, Jena, Germany
| | - Michael F Leitzmann
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - Anja Kroke
- Department of Nutritional, Food and Consumer Sciences, University of Applied Sciences, Fulda, Germany
| | - Heiner Boeing
- Department of Epidemiology, German Institute of Human Nutrition Potsdam Rehbruecke, Nuthetal, Germany
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215
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Meerpohl JJ, Naude CE, Garner P, Mustafa RA, Schünemann HJ. Comment on "Perspective: NutriGrade: A Scoring System to Assess and Judge the Meta-Evidence of Randomized Controlled Trials and Cohort Studies in Nutrition Research". Adv Nutr 2017; 8:789-790. [PMID: 28916579 PMCID: PMC5593107 DOI: 10.3945/an.117.016188] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Joerg J Meerpohl
- From Cochrane Germany, Medical Center–University of Freiburg, Freiburg, Germany (JJM, e-mail: ); the Center for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa (CEN); the Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom (PG); the Division of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, KS (RAM); and the Department of Health Research, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada (HJS)
| | - Celeste E Naude
- From Cochrane Germany, Medical Center–University of Freiburg, Freiburg, Germany (JJM, e-mail: ); the Center for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa (CEN); the Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom (PG); the Division of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, KS (RAM); and the Department of Health Research, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada (HJS)
| | - Paul Garner
- From Cochrane Germany, Medical Center–University of Freiburg, Freiburg, Germany (JJM, e-mail: ); the Center for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa (CEN); the Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom (PG); the Division of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, KS (RAM); and the Department of Health Research, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada (HJS)
| | - Reem A Mustafa
- From Cochrane Germany, Medical Center–University of Freiburg, Freiburg, Germany (JJM, e-mail: ); the Center for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa (CEN); the Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom (PG); the Division of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, KS (RAM); and the Department of Health Research, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada (HJS)
| | - Holger J Schünemann
- From Cochrane Germany, Medical Center–University of Freiburg, Freiburg, Germany (JJM, e-mail: ); the Center for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa (CEN); the Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom (PG); the Division of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, KS (RAM); and the Department of Health Research, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada (HJS)
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216
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Schwedhelm C, Boeing H, Hoffmann G, Aleksandrova K, Schwingshackl L. Effect of diet on mortality and cancer recurrence among cancer survivors: a systematic review and meta-analysis of cohort studies. Nutr Rev 2017; 74:737-748. [PMID: 27864535 PMCID: PMC5181206 DOI: 10.1093/nutrit/nuw045] [Citation(s) in RCA: 164] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Context: Evidence of an association between dietary patterns and individual foods and the risk of overall mortality among cancer survivors has not been reviewed systematically. Objective: The aim of this meta-analysis of cohort studies was to investigate the association between food intake and dietary patterns and overall mortality among cancer survivors. Data Sources: The PubMed and Embase databases were searched. Study Selection: A total of 117 studies enrolling 209 597 cancer survivors were included. Data Extraction: The following data were extracted: study location, types of outcome, population characteristics, dietary assessment method, risk estimates, and adjustment factors. Results: Higher intakes of vegetables and fish were inversely associated with overall mortality, and higher alcohol consumption was positively associated with overall mortality (RR, 1.08; 95%CI, 1.02–1.16). Adherence to the highest category of diet quality was inversely associated with overall mortality (RR, 0.78; 95%CI, 0.72–0.85; postdiagnosis RR, 0.79; 95%CI, 0.71–0.89), as was adherence to the highest category of a prudent/healthy dietary pattern (RR, 0.81; 95%CI, 0.67–0.98; postdiagnosis RR, 0.77; 95%CI, 0.60–0.99). The Western dietary pattern was associated with increased risk of overall mortality (RR, 1.46; 95%CI, 1.27–1.68; postdiagnosis RR, 1.51; 95%CI, 1.24–1.85). Conclusion: Adherence to a high-quality diet and a prudent/healthy dietary pattern is inversely associated with overall mortality among cancer survivors, whereas a Western dietary pattern is positively associated with overall mortality in this population.
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Affiliation(s)
- Carolina Schwedhelm
- C. Schwedhelm, H. Boeing, and L. Schwingshackl are with the Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany. G. Hoffmann is with the Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Vienna, Austria. K. Aleksandrova is with the Nutrition, Immunity, and Metabolism Start-up Lab, Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Heiner Boeing
- C. Schwedhelm, H. Boeing, and L. Schwingshackl are with the Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany. G. Hoffmann is with the Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Vienna, Austria. K. Aleksandrova is with the Nutrition, Immunity, and Metabolism Start-up Lab, Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Georg Hoffmann
- C. Schwedhelm, H. Boeing, and L. Schwingshackl are with the Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany. G. Hoffmann is with the Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Vienna, Austria. K. Aleksandrova is with the Nutrition, Immunity, and Metabolism Start-up Lab, Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Krasimira Aleksandrova
- C. Schwedhelm, H. Boeing, and L. Schwingshackl are with the Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany. G. Hoffmann is with the Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Vienna, Austria. K. Aleksandrova is with the Nutrition, Immunity, and Metabolism Start-up Lab, Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Lukas Schwingshackl
- C. Schwedhelm, H. Boeing, and L. Schwingshackl are with the Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany. G. Hoffmann is with the Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Vienna, Austria. K. Aleksandrova is with the Nutrition, Immunity, and Metabolism Start-up Lab, Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany.
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217
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Magni P, Bier DM, Pecorelli S, Agostoni C, Astrup A, Brighenti F, Cook R, Folco E, Fontana L, Gibson RA, Guerra R, Guyatt GH, Ioannidis JPA, Jackson AS, Klurfeld DM, Makrides M, Mathioudakis B, Monaco A, Patel CJ, Racagni G, Schünemann HJ, Shamir R, Zmora N, Peracino A. Perspective: Improving Nutritional Guidelines for Sustainable Health Policies: Current Status and Perspectives. Adv Nutr 2017; 8:532-545. [PMID: 28710141 PMCID: PMC5502870 DOI: 10.3945/an.116.014738] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
A large body of evidence supports the notion that incorrect or insufficient nutrition contributes to disease development. A pivotal goal is thus to understand what exactly is appropriate and what is inappropriate in food ingestion and the consequent nutritional status and health. The effective application of these concepts requires the translation of scientific information into practical approaches that have a tangible and measurable impact at both individual and population levels. The agenda for the future is expected to support available methodology in nutrition research to personalize guideline recommendations, properly grading the quality of the available evidence, promoting adherence to the well-established evidence hierarchy in nutrition, and enhancing strategies for appropriate vetting and transparent reporting that will solidify the recommendations for health promotion. The final goal is to build a constructive coalition among scientists, policy makers, and communication professionals for sustainable health and nutritional policies. Currently, a strong rationale and available data support a personalized dietary approach according to personal variables, including sex and age, circulating metabolic biomarkers, food quality and intake frequency, lifestyle variables such as physical activity, and environmental variables including one's microbiome profile. There is a strong and urgent need to develop a successful commitment among all the stakeholders to define novel and sustainable approaches toward the management of the health value of nutrition at individual and population levels. Moving forward requires adherence to well-established principles of evidence evaluation as well as identification of effective tools to obtain better quality evidence. Much remains to be done in the near future.
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Affiliation(s)
- Paolo Magni
- Department of Pharmacological and Biomolecular Sciences, and
| | - Dennis M Bier
- Children’s Nutrition Research Center, Baylor College of Medicine, Houston, TX
| | | | - Carlo Agostoni
- Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, DISCCO, Università degli Studi di Milano, Milan, Italy
| | - Arne Astrup
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Furio Brighenti
- Department of Food Sciences, University of Parma, Parma, Italy
| | - Robert Cook
- Bazian, Economist Intelligence Unit Healthcare, London, United Kingdom
| | - Emanuela Folco
- Giovanni Lorenzini Medical Science Foundation, Milan, Italy
| | - Luigi Fontana
- Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy;,Department of Medicine, Washington University, St. Louis, MO
| | - Robert A Gibson
- School of Agriculture, Food and Wine, FOODplus Research Centre, University of Adelaide, Adelaide, Australia
| | - Ranieri Guerra
- Department of Preventive Health, Ministry of Health, Rome, Italy
| | - Gordon H Guyatt
- Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | - John PA Ioannidis
- Department of Health Policy and Research, Stanford University, Stanford, CA
| | - Ann S Jackson
- Giovanni Lorenzini Medical Science Foundation, Houston, TX
| | - David M Klurfeld
- Human Nutrition Program, USDA Agricultural Research Service, Beltsville, MD
| | - Maria Makrides
- Healthy Mothers, Babies and Children, South Australian Health and Medical Research Institute, Adelaide, Australia
| | | | | | - Chirag J Patel
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA
| | - Giorgio Racagni
- Department of Pharmacological and Biomolecular Sciences, and
| | - Holger J Schünemann
- Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada
| | - Raanan Shamir
- Institute of Gastroenterology, Nutrition and Liver Diseases, Schneider Children’s Medical Center of Israel, Sackler Faculty of Medicine, University of Tel Aviv, Tel Aviv, Israel; and
| | - Niv Zmora
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Andrea Peracino
- Giovanni Lorenzini Medical Science Foundation, Milan, Italy;
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218
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Schwingshackl L, Schwedhelm C, Hoffmann G, Lampousi AM, Knüppel S, Iqbal K, Bechthold A, Schlesinger S, Boeing H. Food groups and risk of all-cause mortality: a systematic review and meta-analysis of prospective studies. Am J Clin Nutr 2017; 105:1462-1473. [PMID: 28446499 DOI: 10.3945/ajcn.117.153148] [Citation(s) in RCA: 249] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 03/28/2017] [Indexed: 11/14/2022] Open
Abstract
Background: Suboptimal diet is one of the most important factors in preventing early death and disability worldwide.Objective: The aim of this meta-analysis was to synthesize the knowledge about the relation between intake of 12 major food groups, including whole grains, refined grains, vegetables, fruits, nuts, legumes, eggs, dairy, fish, red meat, processed meat, and sugar-sweetened beverages, with risk of all-cause mortality.Design: We conducted a systematic search in PubMed, Embase, and Google Scholar for prospective studies investigating the association between these 12 food groups and risk of all-cause mortality. Summary RRs and 95% CIs were estimated with the use of a random effects model for high-intake compared with low-intake categories, as well as for linear and nonlinear relations. Moreover, the risk reduction potential of foods was calculated by multiplying the RR by optimal intake values (serving category with the strongest association) for risk-reducing foods or risk-increasing foods, respectively.Results: With increasing intake (for each daily serving) of whole grains (RR: 0.92; 95% CI: 0.89, 0.95), vegetables (RR: 0.96; 95% CI: 0.95, 0.98), fruits (RR: 0.94; 95% CI: 0.92, 0.97), nuts (RR: 0.76; 95% CI: 0.69, 0.84), and fish (RR: 0.93; 95% CI: 0.88, 0.98), the risk of all-cause mortality decreased; higher intake of red meat (RR: 1.10; 95% CI: 1.04, 1.18) and processed meat (RR: 1.23; 95% CI: 1.12, 1.36) was associated with an increased risk of all-cause mortality in a linear dose-response meta-analysis. A clear indication of nonlinearity was seen for the relations between vegetables, fruits, nuts, and dairy and all-cause mortality. Optimal consumption of risk-decreasing foods results in a 56% reduction of all-cause mortality, whereas consumption of risk-increasing foods is associated with a 2-fold increased risk of all-cause mortality.Conclusion: Selecting specific optimal intakes of the investigated food groups can lead to a considerable change in the risk of premature death.
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Affiliation(s)
- Lukas Schwingshackl
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany;
| | - Carolina Schwedhelm
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Vienna, Austria
| | - Anna-Maria Lampousi
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Sven Knüppel
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Khalid Iqbal
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | | | - Sabrina Schlesinger
- Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, United Kingdom; and.,Institute for Biometry and Epidemiology, Leibniz Institute for Diabetes Research, Heinrich Heine University Düsseldorf, Dusseldorf, Germany
| | - Heiner Boeing
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
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219
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Schwingshackl L, Chaimani A, Hoffmann G, Schwedhelm C, Boeing H. Impact of different dietary approaches on blood pressure in hypertensive and prehypertensive patients: protocol for a systematic review and network meta-analysis. BMJ Open 2017; 7:e014736. [PMID: 28446526 PMCID: PMC5566592 DOI: 10.1136/bmjopen-2016-014736] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
INTRODUCTION Lifestyle modification is one of the cornerstones in the management of hypertension. According to the most recent guidelines by the American Heart Association, all patients with hypertension should adopt the following dietary advices: increased consumption of fresh fruits, vegetables, low-fat dairy products and sodium reduction. The aim of the present study is to assess the efficacy of different dietary approaches on systolic and diastolic blood pressure in patients with hypertension and high normal blood pressure in a systematic review including a pairwise and network meta-analysis of randomised trials. METHODS AND ANALYSIS We conducted searches in Cochrane Central Register of Controlled Trials in the Cochrane Library, PubMed and Google Scholar until November 2016. Citations, abstracts and relevant papers were screened for eligibility by two reviewers independently. Randomised trials were included if they met the following criteria: (1) hypertension (as mean values ≥140 mm Hg systolic blood pressure and/or ≥90 mm Hg diastolic blood pressure) or high normal blood pressure (mean systolic blood pressure ≥130 mm Hg and/or mean diastolic blood pressure ≥85 mm Hg), (2) age ≥18 years, (3) intervention diets (different type of dietary approaches, eg, dietary approach to stop hypertension diet; Mediterranean diet, vegetarian diet, palaeolithic diet, low sodium diet) either hypocaloric, isocaloric or ad libitum diets, (4) intervention period ≥12 weeks. For each outcome measure of interest, random effects pairwise and network meta-analyses were performed in order to determine the pooled relative effect of each intervention relative to every other intervention in terms of the postintervention values (or change scores). Subgroup analyses were planned for hypertensive status, study length, sample size, age and sex. ETHICS AND DISSEMINATION As this study is based solely on the published literature, no ethics approval was required. We published our network meta-analysis in a peer-reviewed scientific journal. SYSTEMATIC REVIEW REGISTRATION PROSPERO: CRD42016049243.
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Affiliation(s)
- Lukas Schwingshackl
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Anna Chaimani
- Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Medical School Campus, University of Ioannina, Ioannina, Greece
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Vienna, Austria
| | - Carolina Schwedhelm
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
| | - Heiner Boeing
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Nuthetal, Germany
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220
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Schwingshackl L, Hoffmann G, Lampousi AM, Knüppel S, Iqbal K, Schwedhelm C, Bechthold A, Schlesinger S, Boeing H. Food groups and risk of type 2 diabetes mellitus: a systematic review and meta-analysis of prospective studies. Eur J Epidemiol 2017; 32:363-375. [PMID: 28397016 PMCID: PMC5506108 DOI: 10.1007/s10654-017-0246-y] [Citation(s) in RCA: 450] [Impact Index Per Article: 64.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 04/06/2017] [Indexed: 01/04/2023]
Abstract
The aim of this systematic review and meta-analysis was to synthesize the knowledge about the relation between intake of 12 major food groups and risk of type 2 diabetes (T2D). We conducted a systematic search in PubMed, Embase, Medline (Ovid), Cochrane Central, and Google Scholar for prospective studies investigating the association between whole grains, refined grains, vegetables, fruits, nuts, legumes, eggs, dairy, fish, red meat, processed meat, and sugar-sweetened beverages (SSB) on risk of T2D. Summary relative risks were estimated using a random effects model by contrasting categories, and for linear and non-linear dose–response relationships. Six out of the 12 food-groups showed a significant relation with risk of T2D, three of them a decrease of risk with increasing consumption (whole grains, fruits, and dairy), and three an increase of risk with increasing consumption (red meat, processed meat, and SSB) in the linear dose–response meta-analysis. There was evidence of a non-linear relationship between fruits, vegetables, processed meat, whole grains, and SSB and T2D risk. Optimal consumption of risk-decreasing foods resulted in a 42% reduction, and consumption of risk-increasing foods was associated with a threefold T2D risk, compared to non-consumption. The meta-evidence was graded “low” for legumes and nuts; “moderate” for refined grains, vegetables, fruit, eggs, dairy, and fish; and “high” for processed meat, red meat, whole grains, and SSB. Among the investigated food groups, selecting specific optimal intakes can lead to a considerable change in risk of T2D.
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Affiliation(s)
- Lukas Schwingshackl
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany.
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Althanstraße 14, UZA II, 1090, Vienna, Austria
| | - Anna-Maria Lampousi
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany
| | - Sven Knüppel
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany
| | - Khalid Iqbal
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany
| | - Carolina Schwedhelm
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany
| | - Angela Bechthold
- German Nutrition Society, Godesberger Allee 18, 53175, Bonn, Germany
| | - Sabrina Schlesinger
- Department of Epidemiology and Biostatistics, School of Public Health Imperial College London, St. Mary's Campus, Norfolk Place, Paddington, London, W2 1PG, UK.,Institute for Biometry and Epidemiology, Leibniz Institute for Diabetes Research, Heinrich Heine University Düsseldorf, 40225, Duesseldorf, Germany
| | - Heiner Boeing
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany
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221
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Schwingshackl L, Lampousi AM, Portillo MP, Romaguera D, Hoffmann G, Boeing H. Olive oil in the prevention and management of type 2 diabetes mellitus: a systematic review and meta-analysis of cohort studies and intervention trials. Nutr Diabetes 2017; 7:e262. [PMID: 28394365 PMCID: PMC5436092 DOI: 10.1038/nutd.2017.12] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/25/2017] [Accepted: 02/02/2017] [Indexed: 02/08/2023] Open
Abstract
Background/Objectives: Olive oil (OO) as food is composed mainly of fatty acids and bioactive compounds depending from the extraction method. Both had been discussed as health promoting with still open questions. Thus, we conducted a meta-analysis to illustrate the impact of this food on type 2 diabetes (T2D) by investigating the association between OO intake and risk of T2D, and the effect of OO intake in the management of T2D. Subjects/Methods: Searches were performed in PubMed, Cochrane Library and google scholar. First, we conducted a random effect meta-analysis of prospective cohort studies and trials investigating the association between OO and risk of T2D. Second, a meta-analysis was performed to detect the effects of olive oil on glycemic control in patients with T2D. Results: Four cohort studies including 15 784 T2D cases and 29 trials were included in the meta-analysis. The highest OO intake category showed a 16% reduced risk of T2D (RR: 0.84; 95% CI: 0.77, 0.92) compared with the lowest. However, we observed evidence for a nonlinear relationship. In T2D patients OO supplementation resulted in a significantly more pronounced reduction in HbA1c (MD: −0.27% 95% CI: −0.37, −0.17) and fasting plasma glucose (MD: −0.44 mmol l−1; 95% CI −0.66, −0.22) as compared with the control groups. Conclusions: This meta-analysis provides evidence that the intake of OO could be beneficial for the prevention and management of T2D. This conclusion regards OO as food, and might not been valid for single components comprising this food.
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Affiliation(s)
- L Schwingshackl
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - A-M Lampousi
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - M P Portillo
- Nutrition and Obesity Group, Department of Nutrition and Food Sciences, University of Basque Country (UPV/EHU) and Lucio Lascaray Research Center, Vitoria-Gasteiz, Spain.,CIBER Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
| | - D Romaguera
- CIBER Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain.,Health Research Institute of Palma (IdISPa), University Hospital Son Espases, Palma de Mallorca, Spain
| | - G Hoffmann
- Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Vienna, Austria
| | - H Boeing
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
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Impact of different dietary approaches on glycemic control and cardiovascular risk factors in patients with type 2 diabetes: a protocol for a systematic review and network meta-analysis. Syst Rev 2017; 6:57. [PMID: 28320464 PMCID: PMC5360012 DOI: 10.1186/s13643-017-0455-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 03/13/2017] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Dietary advice is one of the cornerstones in the management of type 2 diabetes mellitus. The American Diabetes Association recommended a hypocaloric diet for overweight or obese adults with type 2 diabetes in order to induce weight loss. However, there is limited evidence on the optimal approaches to control hyperglycemia in type 2 diabetes patients. The aim of the present study is to assess the comparative efficacy of different dietary approaches on glycemic control and blood lipids in patients with type 2 diabetes mellitus in a systematic review including a standard pairwise and network meta-analysis of randomized trials. METHODS AND DESIGN We will conduct searches in Cochrane Central Register of Controlled Trials (CENTRAL) on the Cochrane Library, PubMed (from 1966), and Google Scholar. Citations, abstracts, and relevant papers will be screened for eligibility by two reviewers independently. Randomized controlled trials (with a control group or randomized trials with at least two intervention groups) will be included if they meet the following criteria: (1) include type 2 diabetes mellitus, (2) include patients aged ≥18 years, (3) include dietary intervention (different type of diets: e.g., Mediterranean dietary pattern, low-carbohydrate diet, low-fat diet, vegetarian diet, high protein diet); either hypo, iso-caloric, or ad libitum diets, (4) minimum intervention period of 12 weeks. For each outcome measure of interest, random effects pairwise and network meta-analyses will be performed in order to determine the pooled relative effect of each intervention relative to every other intervention in terms of the post-intervention values (or mean differences between the changes from baseline value scores). Subgroup analyses are planned for study length, sample size, age, and sex. DISCUSSION This systematic review will synthesize the available evidence on the comparative efficacy of different dietary approaches in the management of glycosylated hemoglobin (primary outcome), fasting glucose, and cardiovascular risk factors in type 2 diabetes mellitus patients. The results of the present network meta-analysis will influence evidence-based treatment decisions since it will be fundamental for based recommendations in the management of type 2 diabetes. SYSTEMATIC REVIEW REGISTRATION PROSPERO 42016047464.
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Schwingshackl L, Boeing H, Stelmach-Mardas M, Gottschald M, Dietrich S, Hoffmann G, Chaimani A. Dietary Supplements and Risk of Cause-Specific Death, Cardiovascular Disease, and Cancer: A Systematic Review and Meta-Analysis of Primary Prevention Trials. Adv Nutr 2017; 8:27-39. [PMID: 28096125 PMCID: PMC5227980 DOI: 10.3945/an.116.013516] [Citation(s) in RCA: 111] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Our aim was to assess the efficacy of dietary supplements in the primary prevention of cause-specific death, cardiovascular disease (CVD), and cancer by using meta-analytical approaches. Electronic and hand searches were performed until August 2016. Inclusion criteria were as follows: 1) minimum intervention period of 12 mo; 2) primary prevention trials; 3) mean age ≥18 y; 4) interventions included vitamins, fatty acids, minerals, supplements containing combinations of vitamins and minerals, protein, fiber, prebiotics, and probiotics; and 5) primary outcome of all-cause mortality and secondary outcomes of mortality or incidence from CVD or cancer. Pooled effects across studies were estimated by using random-effects meta-analysis. Overall, 49 trials (69 reports) including 287,304 participants met the inclusion criteria. Thirty-two trials were judged as low risk-, 15 trials as moderate risk-, and 2 trials as high risk-of-bias studies. Supplements containing vitamin E (RR: 0.88; 95% CI: 0.80, 0.96) significantly reduced cardiovascular mortality risk, whereas supplements with folic acid reduced the risk of CVD (RR: 0.81; 95% CI: 0.70, 0.94). Vitamins D, C, and K; selenium; zinc; magnesium; and eicosapentaenoic acid showed no significant risk reduction for any of the outcomes. On the contrary, vitamin A was linked to an increased cancer risk (RR: 1.16; 95% CI: 1.00, 1.35). Supplements with β-carotene showed no significant effect; however, in the subgroup with β-carotene given singly, an increased risk of all-cause mortality by 6% (RR: 1.06; 95% CI: 1.02, 1.10) was observed. Taken together, we found insufficient evidence to support the use of dietary supplements in the primary prevention of cause-specific death, incidence of CVD, and incidence of cancer. The application of some supplements generated small beneficial effects; however, the heterogeneous types and doses of supplements limit the generalizability to the overall population.
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Affiliation(s)
- Lukas Schwingshackl
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany;
| | - Heiner Boeing
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Marta Stelmach-Mardas
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
- Department of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, Poznan, Poland
| | - Marion Gottschald
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Stefan Dietrich
- Department of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany
| | - Georg Hoffmann
- Department of Nutritional Sciences, Faculty of Life Sciences, University of Vienna, Vienna, Austria; and
| | - Anna Chaimani
- Department of Hygiene and Epidemiology, School of Medicine, University of Ioannina, Ioannina, Greece
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Schwingshackl L, Chaimani A, Bechthold A, Iqbal K, Stelmach-Mardas M, Hoffmann G, Schwedhelm C, Schlesinger S, Boeing H. Food groups and risk of chronic disease: a protocol for a systematic review and network meta-analysis of cohort studies. Syst Rev 2016; 5:125. [PMID: 27460907 PMCID: PMC4962508 DOI: 10.1186/s13643-016-0302-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 07/18/2016] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND There is a lack of systematic and comprehensive evaluations whether food intakes lower or increase risk of chronic diseases. In this network meta-analysis of prospective cohort studies, we aim to evaluate the effects of different foods on risk of chronic diseases. METHODS/DESIGN We will search PubMed and EMBASE. This will be supplemented by a hand search and author contacts. Citations, abstracts, and relevant papers will be screened for eligibility by two reviewers independently. Prospective cohort studies will be included if they meet the following criteria: (1) evaluate the association of single food or food groups with all-cause mortality, cardiovascular diseases (incidence and mortality), cancer (incidence and mortality) or risk of type 2 diabetes. The following food groups will be evaluated: whole grains, refined grains, vegetables, fruits, nuts, legumes, eggs, dairy products, fish, red meat, processed meat and sugar-sweetened beverages; (2) include participants ≥18 years of age; and (3) study population were free of outcome(s) of interest at the onset of the study. To assess study quality, we will extract the following characteristics: study size, duration of follow-up, dietary assessment method, assessment of outcome and adjustment factors. If the identified studies appear sufficiently similar within and across the different comparisons between pairs of food groups, we will estimate summary-relative effects using random effects network meta-analysis. Subgroup and meta-regression analyses will be performed stratified by different follow-up cut-points, geographical region and sex. DISCUSSION This is a presentation of the study protocol only. Results and conclusions are pending completion of this study. Our systematic review will be of great value to national and international authorities for evidence-based nutritional recommendation/guidelines, regarding the implementation of food-based dietary guidelines for prevention of chronic diseases. Moreover, our results can be implemented to develop new diet quality indices/scores. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42016037069.
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Affiliation(s)
- Lukas Schwingshackl
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
| | - Anna Chaimani
- Department of Hygiene and Epidemiology University of Ioannina School of Medicine, Medical School Campus, University of Ioannina, Ioannina, 45110 Greece
| | - Angela Bechthold
- German Nutrition Society, Godesberger Allee 18, 53175 Bonn, Germany
| | - Khalid Iqbal
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
| | - Marta Stelmach-Mardas
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
- Department of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, Szpitalna 27/33, 60-537 Poznan, Poland
| | - Georg Hoffmann
- Department of Nutritional Sciences, University of Vienna, Althanstraße 14, UZA II, 1090 Vienna, Austria
| | - Carolina Schwedhelm
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
| | - Sabrina Schlesinger
- Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, St. Mary’s Campus, Norfolk Place, Paddington, London W2 1PG UK
| | - Heiner Boeing
- German Institute of Human Nutrition Potsdam-Rehbruecke (DIfE), Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
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