Obesity Is Associated with a Weakened Gingival Inflammatory Cytokine Response.

Background and Objectives: An obesity-related elevated body mass index (BMI) across life is associated with chronic low-grade inflammation and increased levels of C-reactive protein (CRP) in blood. CRP is a marker and promoter of inflammation. The objectives of this study were to examine the effect of obesity on the relationship between peripheral and gingival CRP levels and to examine the effects of gingival CRP levels on gingival fluid inflammatory cytokines in periodontitis-resistant obese individuals. Materials and Methods: Thirty-nine participants in good periodontal health were recruited. Twenty patients were classified as lean and nineteen as obese based on their BMI levels. A thorough periodontal assessment was carried out. Gingival crevicular fluid (GCF) and blood samples were collected. Both GCF and blood samples were analyzed for interleukin-1ß (IL-1ß), interleukin-6 (IL-6), interleukin-8 (IL-8), tumor necrosis factor-α (TNF-α), interleukin-10 (IL-10), interleukin-17A (IL-17A), and CRP. Results: GCF CRP levels were significantly higher in the obese than in the lean individuals. No statistically significant differences were noted between the two groups in either GCF or blood in terms of any of the inflammatory cytokine levels. IL-17A was not detected in the GCF of most subjects in both groups. GCF CRP levels were positively associated with blood CRP levels, and the association tended to be stronger in the obese individuals. GCF CRP showed no associations with GCF IL-10 in both groups. Although GCF CRP levels were positively associated with multiple GCF inflammatory cytokines (e.g., IL-1ß, IL-6, IL-8, and TNF-α) in all subjects, the associations tended to be weaker in the obese individuals (e.g., IL-1ß, IL-6, and TNF-α). Furthermore, the levels of the GCF inflammatory cytokines IL-6 and TNF-α were decreased in the obese individuals. Conclusions: Obesity unfavorably influences the relationship between blood and GCF CRP levels and promotes increased CRP levels in GCF. Collectively, the findings suggest a weakened inflammatory cytokine response in the gingival tissues of obese individuals.

Metabolomic profiles of obesity and subgingival microbiome in periodontally healthy individuals: A cross-sectional study.

AIM: Since blood metabolomic profiles of obese individuals are known to be altered, our objective was to examine the association between obesity-related metabolic patterns and subgingival microbial compositions in obese and non-obese periodontally healthy individuals. MATERIALS AND METHODS: Thirty-nine periodontally healthy subjects were enrolled. Based on body mass index scores, 20 subjects were categorized as lean and 19 as obese. A comprehensive periodontal examination was performed. Subgingival plaque and blood samples were collected. Plaque samples were analysed for bacteria using 16S rDNA sequencing. Untargeted metabolomic profiling (mass spectrometry) was used to quantify metabolites in serum. RESULTS: Obese subjects were statistically associated with several periodontopathic taxa including Dialister invisus, Prevotella intermedia, Prevotella denticola, Fusobacterium nucleatum_subsp.vincentii, Mogibacterium diversum, Parvimonas micra and Shuttleworthia satelles. In obese individuals, an amino acid-related metabolic pattern was elevated; however, there was a decrease in metabolic patterns related to lipids and cofactor/vitamins. These metabolic perturbations were associated with multiple subgingival bacterial species that differentiated lean from obese individuals. CONCLUSIONS: Obesity-related perturbations in circulating blood metabolites are associated with the development of periodontopathic bacterial colonization in the subgingival microbiome and consequently may increase the risk for periodontal disease in obese individuals.

Chronic Absenteeism: Risks and Protective Factors Among Low-Income, Minority Children and Adolescents.

BACKGROUND: Low-income and racial/ethnic minority students often face distinct challenges in attending school eading to lower academic performance, low graduation rates, and overall, an indicator of diminished long-term social and financial stability. Chronic absenteeism is a national problem and to address this, a better understanding of risks and points of intervention for the students most at risk is needed. This cross-sectional study sought to assess risks and protective factors associated with chronic absenteeism in a predominantly low-income minority school district in Southern. METHODS: Conducted in southern California, students (N = 24,439) ages 9 to 21 years were recruited. A logistic regression was used to assess the role poor physical and mental health, safety, bullying, and family risk factors attributed to chronic absenteeism. RESULTS: Results revealed that asthma (odds ratio [OR] = 1.35, p < .001), being overweight/obese (OR = 1.38, p < .01), presence of family risk factors (OR = 1.49, p < .001), bullying (OR = 0.84, p < .05) and perceptions of safety at school (OR = 1.24, p < .05) increased the odds of chronic absenteeism, while protective factors such as support (OR = 1.30, p < .001), increased sleep (OR = 0.96, p < .001) and positive growth mindset (OR = 0.96, p < .001), mitigated it. CONCLUSION: This study not only identifies risk but protective factors worth adhering to, to promote school attendance. Future research should further examine the role of mental health in chronic absenteeism.

Cross-sectional comparisons of subgingival microbiome and gingival fluid inflammatory cytokines in periodontally healthy vegetarians versus non-vegetarians.

BACKGROUND: Vegetarian diets are known to reduce inflammation. The objective of this study was to test the hypothesis that reduced inflammation associated with a vegetarian diet would promote a more commensal subgingival bacterial profile. METHODS: A total of 39 periodontally healthy subjects (PD ≤3 mm, bleeding on probing <10%) were enrolled. Dietary intake was assessed by a food frequency questionnaire. A comprehensive periodontal examination was performed. Gingival crevicular fluid (GCF) and subgingival plaque samples were collected. GCF samples were assessed for interleukin-1ß, interleukin-6, interleukin-8, tumor necrosis factor-alpha, and interleukin-10. Plaque samples were analyzed for bacteria using 16S rDNA sequencing on an Illumina platform. GenBank database was used for taxonomy classification. RESULTS: Twenty-three subjects were categorized as vegetarian and 16 non-vegetarians. Clinical periodontal measures and GCF cytokine levels were statistically comparable between the two groups. Measures of microbial richness and alpha diversity were also comparable between the two dietary groups. Vegetarians harbored higher levels of phyla associated with gingival health (Actinobacteria, and Proteobacteria). Two species known to be associated with periodontitis (Mogibacterium timidum and Veillonella rogosae) were prominent in non-vegetarians. Pearson's correlations between GCF inflammatory cytokines and microbial taxa differed between vegetarians and non-vegetarians. In vegetarians, the anti-inflammatory cytokine IL-10 positively correlated with two species known to be associated with periodontal health (Peptidiphaga sp. HMT183 and Rothia aeria). CONCLUSIONS: Diet is directly and indirectly associated with the microbial composition of subgingival plaque. A vegetarian diet may promote a subgingival microbiota associated with periodontal health.

Vegetarian Dietary Patterns and Cognitive Function among Older Adults: The Adventist Health Study-2.

We explored effects on cognitive function of following plant-based vegetarian compared with non-vegetarian dietary patterns in otherwise healthy older community-dwelling members of the Adventist Health Study-2 cohort (n = 132). Cognition was assessed using a comprehensive neuropsychological battery; a principal components analysis derived processing speed, executive function, and memory/language factors. Mild memory impairment (MMI) (n = 26, 19.7%) was identified by memory tests. Vegetarians consumed (a) meats, fish, and dairy <1 time/month, (b) dairy ≥1 time/month and meats, and fish <1 time/month, or (c) fish ≥1 time/month, no limits on dairy, and meats <1 time/month. Dietary patterns were determined at baseline, for each decade, and at cognitive assessment; a diet stability score was calculated. Factor scores were not different between vegetarians and non-vegetarians, nor was dietary pattern associated with a lower odds of MMI. A more stable diet over the life course was associated with better memory/language [ß = 0.021 SE(ß) = 0.008; p = 0.01]. This exploratory study did not support differences in processing speed, executive function, or memory/language abilities between vegetarians and non-vegetarians but did suggest that a more stable dietary pattern which was characteristic of vegetarians was associated with better memory/language abilities.

Observed Physical Function Is Associated With Better Cognition Among Elderly Adults: The Adventist Health Study-2.

Lifestyle factors may individually protect against the development of mild cognitive impairment. We investigate the relationships between both self-reported physical activity and measured physical function with cognition in a population of elderly adults, more than half of whom follow vegetarian dietary patterns. Otherwise healthy adults (n = 127, mean age 74.9 ± 7.9 years, 61.3% current vegetarians) were assessed using a comprehensive neuropsychological battery. A principal components analysis derived processing speed, executive function, and memory/language factors. Participants reported current levels of vigorous physical activity on questionnaires, and physical function and mobility were measured with the Physical Performance Test (PPT) and Timed Up and Go (TUG) Test. Generalized linear models estimated ß coefficients for cross-sectional associations between cognitive factors and indicators of physical abilities and self-reported physical activity. Better physical function indicated by PPT was associated with higher scores on the processing speed factor (ß = 0.21 SDs for each 4.4-point increase in PPT score; p = 0.02). Faster TUG times were also associated with higher processing speed factor scores (ß = 0.21 SDs increase for each 2.8 second less TUG time; p = 0.02). Self-reported levels of vigorous physical activity were not associated with any area of cognitive function; the association between PPT, TUG and processing speed was independent of physical activity. Associations between PPT and TUG and processing speed were stronger among participants who followed vegetarian dietary patterns. Better physical function may have an effect on cognition in a context of healthy lifestyles.

Protocol understanding and anxiety in perioperative clinical trial patients approached for consent on the day of surgery.

OBJECTIVE: To determine whether approaching patients for consent on the day of surgery impairs understanding or produces unacceptable anxiety compared with obtaining consent before the day of surgery. PATIENTS AND METHODS: We assessed the effect of the timing of obtaining consent for a moderate- to high-risk factorial trial of clonidine and aspirin in patients having noncardiac surgery. Between February 1, 2011, and November 31, 2011, 2 study personnel used the same standardized script to recruit patients before the day of surgery or on the day of surgery. Patients eligible for the trial were preferentially approached to obtain consent before the day of surgery in the preoperative clinic. Patients who did not attend the preoperative clinic or could not be approached that day were approached for consent on the day of surgery. We evaluated anxiety before and after the trial was discussed, protocol knowledge, consent rates, and perceived obligation to participate. All comparisons were adjusted for differences in potentially confounding variables using inverse propensity score weighting. RESULTS: Patients approached on the day of surgery compared with before the day of surgery had noninferior understanding of the comprehension score (adjusted mean difference, -0.19; 90% CI, -0.47 to 0.10; P<.001 for noninferiority) and a noninferior mean increase in the postapproach anxiety score (adjusted mean difference, 0.19; 90% CI, -0.29 to 0.68; P=.003 for noninferiority). Perceived obligation to participate was not greater on the day of surgery (adjusted mean difference, 0.09; 95% CI, -0.21 to 0.40; P=.57 for superiority); however, consent rates were significantly lower (31% vs 59%; odds ratio, 0.49; 90% CI, 0.33 to 0.72; P=.46 for noninferiority). CONCLUSION: Approaching patients to obtain consent to participate in a perioperative interventional trial on the day of surgery does not compromise essential elements of the consent process. TRIAL REGISTRATION: clinicaltrials.gov Identifier: NCT01082874.