Metagenomic analysis reveals associations between salivary microbiota and body composition in early childhood

Secular trends in dental caries in Korean children and adolescents: 2007-2019 Korea National Health and Nutritional Examination Survey

Dental caries is a common preventable childhood disease that has negative effects on physical, psychological, and social well-being. The present study was conducted to examine the secular trends in the prevalence of dental caries among Korean children and adolescents over time through subgroup analysis based on age, sex, abdominal obesity, obesity, and metabolic syndrome (MetS). This serial cross-sectional study utilized representative data from the Korea National Health and Nutritional Examination Survey, covering the period from 2007 to 2019. The study participants included 9,702 children and adolescents aged between 10 and 18 years. A linear-by-linear association test was performed to evaluate the secular trend of dental caries according to the subgroups. The mean prevalence of dental caries significantly decreased in both boys and girls during the study period (all p-values for trend < 0.001). These trends were consistent across different age subgroups: 10-12, 13-15, and 16-18 years. In subgroup analysis, the prevalence of dental caries significantly decreased in normal-weight boys and girls (all p-values for trend < 0.001). However, no significant decrease was observed in the overweight or obese groups for either sex. Importantly, the prevalence of dental caries did not decrease significantly in subgroups with abdominal obesity or MetS. In the non-abdominal obesity group, both boys and girls showed a significant decrease in dental caries prevalence (all p-values for trend < 0.001), while in the abdominal obesity group, a significant decrease was observed only in boys (p-value for trend = 0.027). No significant decrease was observed in the abdominal obesity group for girls. Similarly, in the non-MetS group, both boys and girls showed a significant decrease in dental caries prevalence (all p-values for trend < 0.001), while no significant decrease was observed in the MetS group for both sexes. The prevalence of dental caries has significantly decreased over the past 13 years among Korean children and adolescents. However, in subgroups with obesity or overweight, abdominal obesity, and MetS, no decrease was observed in the prevalence of dental caries.

The link between obesity and the gut microbiota and immune system in early-life

In early-life, the gut microbiota is highly modifiable, being modulated by external factors such as maternal microbiota, mode of delivery, and feeding strategies. The composition of the child's gut microbiota will deeply impact the development and maturation of its immune system, with consequences for future health. As one of the main sources of microorganisms to the child, the mother represents a crucial factor in the establishment of early-life microbiota, impacting the infant's wellbeing. Recent studies have proposed that dysbiotic maternal gut microbiota could be transmitted to the offspring, influencing the development of its immunity, and leading to the development of diseases such as obesity. This paper aims to review recent findings in gut microbiota and immune system interaction in early-life, highlighting the benefits of a balanced gut microbiota in the regulation of the immune system.

Effects of intergenerational transmission of small intestinal bacteria cultured from stunted Bangladeshi children with enteropathy

Environmental enteric dysfunction (EED), a small intestinal disorder found at a high prevalence in stunted children, is associated with gut mucosal barrier disruption and decreased absorptive capacity due to reduced intact small intestinal villi1-4. To test the hypothesis that intergenerational transmission of a perturbed small intestinal microbiota contributes to undernutrition by inducing EED5, we characterized two consortia of bacterial strains cultured from duodenal aspirates from stunted Bangladeshi children with EED - one of which induced local and systemic inflammation in gnotobiotic female mice. Offspring of dams that received this inflammatory consortium exhibited immunologic changes along their gut that phenocopied features of EED in children. Single nucleus plus bulk RNA-sequencing revealed alterations in inter-cellular signaling pathways related to intestinal epithelial cell renewal, barrier integrity and immune function while analyses of cerebral cortex disclosed alterations in glial- and endothelial-neuronal signaling pathways that regulate neural growth/axonal guidance, angiogenesis and inflammation. Analysis of ultrasonic vocalization calls in gnotobiotic P5-P9 pups indicated increased arousal and perturbed neurodevelopment in the offspring of dams harboring the inflammation-inducing consortium. Cohousing experiments and follow-up screening of candidate disease-promoting bacterial isolates identified a strain typically found in the oral microbiota (Campylobacter concisus) as a contributor to enteropathy. Given that fetal growth was also impaired in the dams with the consortium that induced enteropathy, this preclinical model allows the effects of the human small intestinal microbiota on both pre- and postnatal development to be ascertained, setting the stage for identification of small intestinal microbiota-targeted therapeutics for (intergenerational) undernutrition.

Prevalence of Obesity and Dental Caries in High School Adolescents during the First Decade of Saudi Vision 2030: A Cross-Sectional Study

Saudi Vision 2030 was launched in 2016. Obesity and dental caries are both highly prevalent in Saudi adolescents and have been targeted by the Vision's health initiatives. The aim is to assess their prevalence in adolescents during the first decade since the launch of the Vision. This cross-sectional study was conducted in Jeddah, Saudi Arabia using a stratified sample of 571 high school students, with an average age of 16.7 (0.6). Their height and weight were measured, and their body mass index (BMI) was calculated. The decayed, missed, and filled scores (DMFTs) were recorded after an oral examination. Non-parametric tests were used to assess the associations of DMFT with BMI, sex, and school type; and its predictors were assessed. One-third of males were overweight/obese compared with 22% of females. Males exhibited higher DMFTs than females. DMFTs were higher among public school students than among their private school counterparts. No significant association was observed between DMFT and BMI. Sex and school type were significant predictors of DMFT. The prevalence of obesity has slowly decreased in adolescents, but the prevalence of dental caries has not. There was no significant relationship between these conditions. Saudi Vision 2030's current preventive/educational initiatives may be more effective in combating obesity than dental caries.

A Holistic Approach for Ethics and Sustainability in the Food Chain: The Gateway to Oral and Systemic Health

Food production is a complex matter, affecting people's lives, organizations' profits, and the well-being of the whole planet, and has multifaceted ethical considerations surrounding its production, distribution, and consumption. This paper addresses the pressing need to confront ethical challenges within the food system, encompassing issues such as environmental sustainability, food security, and individual food choices for better oral and systemic health of all individuals around the globe. From agricultural practices to global trade and food waste, ethical implications are addressed across various domains, highlighting the interconnectedness of ethical decision-making in the food industry. Central themes explored include the ethical dimensions of food production methods, the impact of global trade on food ethics, and the role of individuals in making ethically informed food choices. Additionally, this paper considers the spiritual and physical significance of food, particularly through the lens of oral health as a gateway to holistic well-being. Recognizing the complexity of the food and mouth ecosystem, this paper calls for serious interventions in legislation and economics to promote ethical protocols and techniques for sustainability reasons. It emphasizes the importance of ethical considerations in food safety management systems, regulatory frameworks, and quality standards. Moreover, this paper underlines the need for a comprehensive approach to address ethical dilemmas and moral values inherent in the food industry and oral health policies, adopting the precautionary principle and ethical decision-making frameworks. This article finally aims to serve as a call to action for stakeholders across the food industry and the healthcare sector, to prioritize ethical practices, promote transparency, rearrange economic parameters, and work towards a more sustainable and equitable food system for inner and outer oral and systemic health and human sustainability for all.

Obesity and Dental Caries in School Children

(1) Background: Childhood obesity and dental caries are common chronic conditions with multiple contributing factors, linked to negative health consequences and significant expenses in healthcare. The aim of this study was to assess the correlation between obesity and dental caries in school-aged children; (2) Methods: Data from 3323 6-12-year-old children from the National Health and Nutrition Examination Survey (NHANES) 2011-2016 were analyzed. The NHANES was conducted at the Centers for Disease Control and Prevention (CDC) in the United States. The CDC standard was used to define obesity. Dental caries was measured during clinical examinations and summarized using DMFT scores for caries experience and prevalence (dt > 0) for untreated caries. The study examined the correlation between obesity and dental caries using regression models that considered demographic variables, family socioeconomic status, and the child's intake of added sugars as controlling factors; (3) Results: The association between obesity and dental caries was not significant in either unadjusted or adjusted models; and (4) Conclusion: The data indicate that untreated caries and caries experiences are not directly correlated with childhood obesity. There are, however, common causes of poor dental health and childhood obesity: culture, poverty level, lifestyle, and family traditions and habits. Dentists must be aware of factors influencing the development of childhood caries so that they can intervene as early as possible.

Associations of central obesity and habitual food consumption with saliva microbiota and its enzymatic profiles - a pilot study in Finnish children

Background

Variation in diversity and composition of saliva microbiota has been linked to weight status, but findings have been inconsistent. Focusing on clinically relevant conditions such as central obesity and using advanced sequencing techniques might fill in the gaps of knowledge.

Aims

We investigated saliva microbiota with shallow metagenome sequencing in children with (n = 14) and without (n = 36) central obesity. Additionally, we examined the role of habitual food consumption on microbial enzymatic repertoire.

Methods

Data comprised 50 children (50% male) with a mean age of 14.2 (SD 0.3) years, selected from the Finnish Health in Teens (Fin-HIT) cohort. Dietary scores for consumption frequency of sweet treats (STI), dairy products (DCI) and plants (PCI) were derived based on a self-administered food frequency questionnaire. Central obesity was defined based on waist-height ratio using the cut-off 0.5. Saliva samples were subjected to whole-metagenome shotgun sequencing, and taxonomic and functional profiling was achieved with METAnnotatorX2 bioinformatics platform.

Results

Groups had an average 20 (95% CI 14-27) cm difference in waist circumference. We identified the lack of Pseudomonas guguagenesis and Prevotella scopos, oulorum and oris as putative biomarkers associated with central obesity and observed a total of 16 enzymatic reactions differing between the groups. DCI was associated with the highest number of enzyme profiles (122), followed by STI (60) and DCI (25) (Pearson correlation p < 0.05). Intriguingly, STI showed a high positive/negative correlation ratio (5.09), while DCI and PCI showed low ratios (0.54 and 0.33, respectively). Thus, the main driver of enzymatic reactions was STI, and the related pathways involved nitrate metabolism induced by Haemophilus parainfluenzae and Veilonella dispar among others.

Conclusion

Clinically relevant differences in central obesity were only modestly reflected in the composition of saliva microbiota. Habitual consumption of sweet treats was a strong determinant of enzymatic reactions of saliva microbiota in children with and without central obesity. The clinical relevance of these findings warrants further studies.

Characteristics of intestinal microbiota in children with idiopathic short stature: a cross-sectional study

Idiopathic short stature (ISS) accounts for more than 70% of childhood short stature cases, with an undefined etiology and pathogenesis, leading to limited treatment. However, recent studies have shown that intestinal microbiota may be associated with ISS. This study aimed to characterize the intestinal microbiota in children with ISS, effect of treatment with growth hormones, and association between specific bacterial species and ISS. This study enrolled 55 children, comprising 40 diagnosed with ISS at Jinhua Hospital, Zhejiang University, and 15 healthy controls. The subjects with ISS were divided into the untreated ISS group (UISS group, 22 children who had not been treated with recombinant human growth hormone [rhGH]), treated ISS group (TISS group, 18 children treated with rhGH for 1 year), and control group (NC group, 15 healthy children). High-throughput sequencing was used to determine the intestinal microbiota characteristics. Higher abundances of Bacteroides, Prevotella, Alistipes, Parabacteroides, Agathobacter and Roseburia were found in the UISS and TISS groups than in the control group, whereas Bifidobacterium, Subdoligranulum, and Romboutsia were less abundant. The composition of intestinal microbiota in the UISS and TISS groups was almost identical, except for Prevotella. The TISS group had significantly lower levels of Prevotella than did the UISS group, which were closer to those of the NC group. Receiver operating characteristic curve analysis revealed that the abundances of Prevotella, Bifidobacterium, Bacteroides, and Subdoligranulum were effective in differentiating between the UISS and NC groups.

CONCLUSION

Alterations in intestinal microbiota may be associated with ISS. Specific bacterial species, such as Prevotella, may be potential diagnostic markers for ISS.

WHAT IS KNOWN

• ISS is associated with the GH-IGF-1 axis. • Recent studies indicated an association between the GH-IGF-1 axis and intestinal microbiota.

WHAT IS NEW

• Children with ISS showed alterations in intestinal microbiota, with a relative increase in the abundance of gut inflammation-related bacteria. • The relative abundances of Prevotella, Bacteroides, Bifidobacterium, and Subdoligranulum may serve as potential diagnostic markers.

Characterization of the oral and gut microbiome in children with obesity aged 3 to 5 years

The ever-increasing global prevalence of obesity has trended towards a younger age. The ecological characteristics and changes of the oral and gut microbial community during childhood are poorly understood.In this study, we analyzed the salivary and fecal microbiota of 30 children with obesity and 30 normal weight children aged 3-5 years via third-generation long-range DNA sequencing,with the aim of understanding the structure of childhood microbiota and identifying specific oral and gut microbial lineages and genera in children that may be associated with obesity.The results revealed significant variation in alpha diversity indices among the four groups (Chao1: P &lt; 0.001; observed species: P &lt; 0.001; Shannon &lt; 0.001). Principal coordinate analysis (PCoA) and nonmetric multidimensional scaling (NMDS) revealed significant differences in oral and gut microbial community structure between obesity and controls. The Firmicutes/Bacteroidetes (F/B) abundance ratios of oral and intestinal flora among children with obesity were higher than those of controls. The most abundant phyla and genera found in oral and intestinal flora were Firmicutes, Proteobacteria, Bacteroidetes, Neisseria, Bacteroides, Faecalibacterium, Streptococcus, Prevotella and so on. Linear discriminant analysis effect size (LEfSe) revealed higher proportions of Filifactor (LDA= 3.98; P &lt; 0.05) and Butyrivibrio (LDA = 2.54; P &lt; 0.001) in the oral microbiota of children with obesity, while the fecal microbiota of children with obesity were more enriched with Faecalibacterium (LDA = 5.02; P &lt; 0.001), Tyzzerella (LDA=3.25; P &lt; 0.01), Klebsiella (LDA = 4.31; P &lt; 0.05),which could be considered as dominant bacterial biomarkers for obesity groups.A total of 148 functional bacterial pathways were found to significantly differ in the oral and gut microbiota among controls and obesity using PICRUSt 2. Most predicted functional pathways were clustered in biosynthesis. In conclusion, This work suggests there were significant differences in oral and gut microbiota in controls and obesity groups, microbiota dysbiosis in childhood might have significant effect on the development of obesity.

The Relationship between Obesity and Childhood Dental Caries in the United States

Background: Childhood obesity and dental caries are prevalent chronic, multifactorial conditions with adverse health consequences and considerable healthcare costs. The aims of this study were: (1) to evaluate the relationship between obesity and dental caries among young children using multiple definitions for both conditions, and (2) to evaluate the role of family socioeconomic status (SES) and the child’s intake of added sugars in explaining this association. Methods: Data from 2775 2−5-year-olds children from the National Health and Nutrition Examination Survey (NHANES) 2011−2018 were analysed. Three different international standards were used to define obesity, namely the World Health Organization (WHO), Centers for Disease Control and Prevention (CDC), and the International Obesity Task Force (IOTF). Dental caries was measured during clinical examinations and summarised as counts (dt and dft scores) and prevalence (untreated caries [dt > 0] and caries experience [dft > 0]). The association of obesity with dental caries was assessed in regression models controlling for demographic factors, family SES and child’s intake of added sugars. Results: In crude models, obesity was associated with greater dt scores when using the IOTF standards (RR: 2.43, 95% CI: 1.11, 5.29) but not when using the WHO and CDC standards; obesity was associated with greater dft scores when using the WHO (1.57, 95%CI: 1.11−2.22), CDC (1.70, 95%CI: 1.17−2.46) and IOTF standards (2.43, 95%CI: 1.73−3.42); obesity was associated with lifetime caries prevalence when using the WHO (1.55, 95%CI: 1.05−2.29), CDC (1.73, 95%CI: 1.14−2.62) and IOTF standards (2.45, 95%CI: 1.61−3.71), but not with untreated caries prevalence. These associations were fully attenuated after controlling for demographic factors, family SES and child’s intake of added sugars. Conclusions: The relationship between obesity and dental caries in primary teeth varied based on the definition of obesity and dental caries used. Associations were observed when obesity was defined using the IOTF standards and dental caries was defined using lifetime indicators. Associations were fully attenuated after adjusting for well-known determinants of both conditions.