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O'Connor SG, O'Connor LE, Higgins KA, Bell BM, Krueger ES, Rawal R, Hartmuller R, Reedy J, Shams-White MM. Conceptualization and Assessment of 24-H Timing of Eating and Energy Intake: A Methodological Systematic Review of the Chronic Disease Literature. Adv Nutr 2024; 15:100178. [PMID: 38242444 PMCID: PMC10877687 DOI: 10.1016/j.advnut.2024.100178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 12/29/2023] [Accepted: 01/16/2024] [Indexed: 01/21/2024] Open
Abstract
Timing of eating (TOE) and energy intake (TOEI) has important implications for chronic disease risk beyond diet quality. The 2020 Dietary Guidelines Advisory Committee recommended developing consistent terminology to address the lack of TOE/TOEI standardization. The primary objective of this methodological systematic review was to characterize the conceptualization and assessment of TOE/TOEI within the chronic disease literature (International Prospective Register of Systematic Reviews registration number: CRD42021236621). Literature searches in Cumulative Index to Nursing and Allied Health Literature (CINAHL) Plus, Embase, PubMed, and Scopus were limited to English language publications from 2000 to August 2022. Eligible studies reported the association between TOE/TOEI and obesity, cardiovascular disease, type 2 diabetes mellitus, cancer, or a related clinical risk factor among adults (≥19 y) in observational and intervention studies. A qualitative synthesis described and compared TOE/TOEI conceptualization, definitions, and assessment methods across studies. Of the 7579 unique publications identified, 259 studies (observational [51.4 %], intervention [47.5 %], or both [1.2 %]) were eligible for inclusion. Key findings indicated that most studies (49.6 %) were conducted in the context of obesity and body weight. TOE/TOEI variables or assigned conditions conceptualized interrelated aspects of time and eating or energy intake in varying ways. Common TOE/TOEI conceptualizations included the following: 1) timepoint (specific time to represent when intake occurs, such as time of breakfast [74.8 %]); 2) duration (length of time or interval when intake does/does not occur, such as "eating window" [56.5 %]); 3) distribution (proportion of daily intake at a given time interval, such as "percentage of energy before noon" [29.8 %]); and 4) cluster (grouping individuals based on temporal ingestive characteristics [5.0 %]). Assessment, definition, and operationalization of 24-h TOE/TOEI variables varied widely across studies. Observational studies most often used surveys or questionnaires (28.9 %), whereas interventions used virtual or in-person meetings (23.8 %) to assess TOE/TOEI adherence. Overall, the diversity of terminology and methods solidifies the need for standardization to guide future research in chrononutrition and to facilitate inter-study comparisons.
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Affiliation(s)
- Sydney G O'Connor
- Office of Behavioral and Social Sciences Research, National Institutes of Health, Bethesda, MD, United States; Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Rockville, MD, United States.
| | - Lauren E O'Connor
- Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Rockville, MD, United States; Food Components and Health Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, United States
| | - Kelly A Higgins
- Food Components and Health Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, United States; Exponent Inc., Washington, DC, United States
| | - Brooke M Bell
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA, United States; Yale School of Public Health, Yale University, New Haven, CT, United States
| | - Emily S Krueger
- Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Rockville, MD, United States
| | - Rita Rawal
- Food Components and Health Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, United States
| | - Reiley Hartmuller
- Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Rockville, MD, United States
| | - Jill Reedy
- Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Rockville, MD, United States
| | - Marissa M Shams-White
- Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Rockville, MD, United States
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Krueger ES, Griffin LE, Beales JL, Lloyd TS, Brown NJ, Elison WS, Kay CD, Neilson AP, Tessem JS. Bioavailable Microbial Metabolites of Flavanols Demonstrate Highly Individualized Bioactivity on In Vitro β-Cell Functions Critical for Metabolic Health. Metabolites 2023; 13:801. [PMID: 37512508 PMCID: PMC10385630 DOI: 10.3390/metabo13070801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 06/23/2023] [Accepted: 06/26/2023] [Indexed: 07/30/2023] Open
Abstract
Dietary flavanols are known for disease preventative properties but are often poorly absorbed. Gut microbiome flavanol metabolites are more bioavailable and may exert protective activities. Using metabolite mixtures extracted from the urine of rats supplemented with flavanols and treated with or without antibiotics, we investigated their effects on INS-1 832/13 β-cell glucose stimulated insulin secretion (GSIS) capacity. We measured insulin secretion under non-stimulatory (low) and stimulatory (high) glucose levels, insulin secretion fold induction, and total insulin content. We conducted treatment-level comparisons, individual-level dose responses, and a responder vs. non-responder predictive analysis of metabolite composition. While the first two analyses did not elucidate treatment effects, metabolites from 9 of the 28 animals demonstrated significant dose responses, regardless of treatment. Differentiation of responders vs. non-responder revealed that levels of native flavanols and valerolactones approached significance for predicting enhanced GSIS, regardless of treatment. Although treatment-level patterns were not discernable, we conclude that the high inter-individual variability shows that metabolite bioactivity on GSIS capacity is less related to flavanol supplementation or antibiotic treatment and may be more associated with the unique microbiome or metabolome of each animal. These findings suggest flavanol metabolite activities are individualized and point to the need for personalized nutrition practices.
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Affiliation(s)
- Emily S. Krueger
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (J.L.B.); (T.S.L.); (N.J.B.); (W.S.E.)
| | - Laura E. Griffin
- Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Kannapolis, NC 28081, USA; (L.E.G.); (C.D.K.); (A.P.N.)
| | - Joseph L. Beales
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (J.L.B.); (T.S.L.); (N.J.B.); (W.S.E.)
| | - Trevor S. Lloyd
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (J.L.B.); (T.S.L.); (N.J.B.); (W.S.E.)
| | - Nathan J. Brown
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (J.L.B.); (T.S.L.); (N.J.B.); (W.S.E.)
| | - Weston S. Elison
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (J.L.B.); (T.S.L.); (N.J.B.); (W.S.E.)
| | - Colin D. Kay
- Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Kannapolis, NC 28081, USA; (L.E.G.); (C.D.K.); (A.P.N.)
| | - Andrew P. Neilson
- Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Kannapolis, NC 28081, USA; (L.E.G.); (C.D.K.); (A.P.N.)
| | - Jeffery S. Tessem
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (J.L.B.); (T.S.L.); (N.J.B.); (W.S.E.)
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Iglesias-Carres L, Krueger ES, Herring JA, Tessem JS, Neilson AP. Potential of Phenolic Compounds and Their Gut Microbiota-Derived Metabolites to Reduce TMA Formation: Application of an In Vitro Fermentation High-Throughput Screening Model. J Agric Food Chem 2022; 70:3207-3218. [PMID: 35235743 DOI: 10.1021/acs.jafc.2c00247] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Trimethylamine N-oxide (TMAO) is a pro-atherosclerotic product of dietary choline metabolism generated by a microbiome-host axis. The first step in this pathway is the enzymatic metabolism of choline to trimethylamine (TMA) by the gut microbiota. This reaction could be targeted to reduce atherosclerosis risk. We aimed to evaluate potential inhibitory effects of select dietary phenolics and their relevant gut microbial metabolites on TMA production via a human ex vivo-in vitro fermentation model. Various phenolics inhibited choline use and TMA production. The most bioactive compounds tested (caffeic acid, catechin, and epicatechin) reduced TMA-d9 formation (compared to control) by 57.5 ± 1.3 to 72.5 ± 0.4% at 8 h and preserved remaining choline-d9 concentrations by 194.1 ± 6.4 to 256.1 ± 6.3% at 8 h. These inhibitory effects were achieved without altering cell respiration or cell growth. However, inhibitory effects decreased at late fermentation times, which suggested that these compounds delay choline metabolism rather than completely inhibiting TMA formation. Overall, caffeic acid, catechin, and epicatechin were the most effective noncytotoxic inhibitors of choline use and TMA production. Thus, these compounds are proposed as lead bioactives to test in vivo.
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Affiliation(s)
- Lisard Iglesias-Carres
- Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Kannapolis, North Carolina 27695, United States
| | - Emily S Krueger
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, Utah 84602, United States
| | - Jacob A Herring
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, Utah 84602, United States
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah 84602, United States
| | - Jeffery S Tessem
- Department of Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, Utah 84602, United States
| | - Andrew P Neilson
- Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Kannapolis, North Carolina 27695, United States
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Krueger ES, Lloyd TS, Tessem JS. The Accumulation and Molecular Effects of Trimethylamine N-Oxide on Metabolic Tissues: It's Not All Bad. Nutrients 2021; 13:nu13082873. [PMID: 34445033 PMCID: PMC8400152 DOI: 10.3390/nu13082873] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/15/2021] [Accepted: 08/19/2021] [Indexed: 02/07/2023] Open
Abstract
Since elevated serum levels of trimethylamine N-oxide (TMAO) were first associated with increased risk of cardiovascular disease (CVD), TMAO research among chronic diseases has grown exponentially. We now know that serum TMAO accumulation begins with dietary choline metabolism across the microbiome-liver-kidney axis, which is typically dysregulated during pathogenesis. While CVD research links TMAO to atherosclerotic mechanisms in vascular tissue, its molecular effects on metabolic tissues are unclear. Here we report the current standing of TMAO research in metabolic disease contexts across relevant tissues including the liver, kidney, brain, adipose, and muscle. Since poor blood glucose management is a hallmark of metabolic diseases, we also explore the variable TMAO effects on insulin resistance and insulin production. Among metabolic tissues, hepatic TMAO research is the most common, whereas its effects on other tissues including the insulin producing pancreatic β-cells are largely unexplored. Studies on diseases including obesity, diabetes, liver diseases, chronic kidney disease, and cognitive diseases reveal that TMAO effects are unique under pathologic conditions compared to healthy controls. We conclude that molecular TMAO effects are highly context-dependent and call for further research to clarify the deleterious and beneficial molecular effects observed in metabolic disease research.
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Affiliation(s)
- Emily S. Krueger
- Department of Nutrition, Dietetics and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (T.S.L.)
| | - Trevor S. Lloyd
- Department of Nutrition, Dietetics and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (T.S.L.)
- Medical Education Program, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Jeffery S. Tessem
- Department of Nutrition, Dietetics and Food Science, Brigham Young University, Provo, UT 84602, USA; (E.S.K.); (T.S.L.)
- Correspondence: ; Tel.: +1-801-422-9082
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Krueger ES. Corrigendum to Krueger et al. Gut Metabolite Trimethylamine N-oxide Protects β Cell Insulin Secretion by Reducing Oxidative Stress and Maintaining Insulin Granule Formation. Curr Dev Nutr 2021;5(Supp_2):nzab033_57. Curr Dev Nutr 2021. [DOI: 10.1093/cdn/nzab099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Krueger ES, Beales JL, Elison WS, Tessem1 JS. Gut Metabolite Trimethylamine N-oxide Protects β Cell Insulin Secretion by Reducing Oxidative Stress and Maintaining Insulin Granule Formation. Curr Dev Nutr 2021. [DOI: 10.1093/cdn/nzab033_057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Objectives
Elevated circulating levels of the dietary metabolite trimethylamine N-oxide (TMAO) is associated with chronic diseases including cardiovascular disease (CVD) and obesity. While TMAO production via the gut microbiome-liver axis and distribution through the circulation is clear, its molecular effects on metabolic tissues are still unclear. Some clinical studies suggest that elevated TMAO levels increase the risk of type 2 diabetes (T2D) where pancreatic β cell insulin secretion is insufficient for blood glucose management. T2D promoting mechanisms limit functional β cell mass by reducing β cell viability and survival, inhibiting proliferation or decreasing insulin secretory function. We hypothesized that TMAO decreases functional β cell mass by one of these mechanisms to aggravate the T2D phenotype.
Methods
Using the INS-1 832/13 β cell line and primary murine islets, we screened the effect of various TMAO concentrations on cell
viability, proliferation, and function. These parameters were measured under standard and glucolipotoxic (GLT) culture conditions to mimic T2D. We investigated TMAO effects, GLT effects and combined effects.
Results
TMAO minimally affected viability, proliferation or function under standard culture conditions across 96-hours of treatment. Culturing with GLT impaired viability, proliferation and function after 24 hours of treatment, mimicking T2D onset. Interestingly, adding 40–80 μM TMAO protected against GLT mediated functional impairments in cells and islets. Further, GLT increased oxidative stress by 2.5-fold and adding TMAO was significantly protective. Electron microscopy reveals that GLT alters insulin granule density whereas TMAO maintains proper granule structure.
Conclusions
These results reject our hypothesis. While TMAO has minor effects on β cells in standard culture conditions, TMAO is sufficient to improve GLT mediated β cell damage by decreasing oxidative stress and maintaining insulin granule formation. These results suggest an early compensatory role for TMAO in countering oxidative damage caused by glucolipotoxicity in β cell function during T2D onset.
Funding Sources
Funding for this study was provided by the Beatson Foundation and the US Department of Agriculture.
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Krueger ES. Freedom to age graciously. Health Educ 1975; 6:2-3. [PMID: 806557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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