The US Preventive Services Task Force (USPSTF) recommends offering or referring adults who are overweight or obese and have additional cardiovascular disease (CVD) risk factors to intensive behavioral counseling interventions to promote a healthful diet and physical activity for CVD prevention. This study determined the proportion of primary care providers (PCPs) who discussed physical activity with most of their at-risk patients and referred them to intensive behavioral counseling, and reported barriers to counseling. Our analyses used data from DocStyles 2015, a Web-based panel survey of 1251 PCPs. Overall, 58.6% of PCPs discussed physical activity with most of their at-risk patients. Among these PCPs, the prevalence of components offered ranged from 98.5% encouraging increased physical activity to 13.9% referring to intensive behavioral counseling. Overall, only 8.1% both discussed physical activity with most at-risk patients and referred to intensive behavioral counseling. Barriers related to PCPs' attitudes and beliefs about counseling (e.g., counseling is not effective) were significantly associated with both discussing physical activity with most at-risk patients and referring them to intensive behavioral counseling (adjusted odds ratio, 1.92; 95% confidence interval, 1.15-3.20). System-level barriers (e.g., referral services not available) were not. Just over half of PCPs discussed physical activity with most of their at-risk patients, and few both discussed physical activity and referred patients to intensive behavioral counseling. Overcoming barriers related to attitudes and beliefs about physical activity counseling could help improve low levels of counseling and referrals to intensive behavioral counseling for CVD prevention.

Obesity and obesity-related metabolic disorders are linked to the intestinal microbiome. However, the causality of changes in the microbiome-host interaction affecting energy metabolism remains controversial. Here, we show the microbiome-derived metabolite δ-valerobetaine (VB) is a diet-dependent obesogen that is increased with phenotypic obesity and is correlated with visceral adipose tissue mass in humans. VB is absent in germ-free mice and their mitochondria but present in ex-GF conventionalized mice and their mitochondria. Mechanistic studies in vivo and in vitro show VB is produced by diverse bacterial species and inhibits mitochondrial fatty acid oxidation through decreasing cellular carnitine and mitochondrial long-chain acyl-CoAs. VB administration to germ-free and conventional mice increases visceral fat mass and exacerbates hepatic steatosis with Western diet but not control diet. Thus, VB provides a molecular target to understand and potentially manage microbiome-host symbiosis/dysbiosis in diet-dependent obesity.

Background: Body fat distribution and diet quality influence clinical outcomes in general populations but are understudied in individuals with cystic fibrosis (CF). The aim of this pilot study was to assess body fat distribution and diet quality in relation to fasting glucose and lung function in adults with CF. Methods: Subjects were 24 adults (ages 18-50) with CF and 25 age-matched controls. The Healthy Eating Index 2015 (HEI-2015) was calculated from 3-day food records and data were adjusted per 1000 kcal. Whole and regional body composition, including visceral adipose tissue (VAT), was assessed by dual energy X-ray absorptiometry. Results: Subjects with CF reported more added sugar intake [26.1 (IQR 18.1) vs. 12.9 (12.5) g/1000 kcal, p b 0.001] and had lower HEI-2015 scores [48.3 (IQR 9.9) vs. 63.9 (27.3), p b 0.001] compared to controls. There were no differences in BMI, total body fat, or lean body mass (LBM) between subjects with CF and controls (p N 0.05 for all), although subjects with CF had higher VAT than control subjects [0.3 (IQR 0.3) vs 0.1 (0.3) kg, p = 0.02]. Among subjects with CF, VAT was positively associated with added sugar intake (p b 0.001) and fasting blood glucose (p = 0.04). Lung function was positively associated with BMI (p = 0.005) and LBM (p = 0.03) but not with adiposity indicators. Conclusions: These novel data link body fat distribution with diet quality and fasting glucose levels in adults with CF, whereas LBM was associated with lung function. This study highlights the importance of increasing diet quality and assessing body composition and fat distribution in the CF population.