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The gut microbiota differs among countries owing to the prevailing diet composition. For the characterization of the gut microbiota of Koreans at different ages in future studies, e.g., in an in vitro human digestion model, we tried to investigate whether the gut microbiota differs between the young and elderly in Korea. Two hundred fecal samples were collected 100 from elderly people (over 65 years old) at geriatric nursing hospitals and 100 from young people (university students, 20-25 years old) in Gyeonggi province, Korea. The composition of the gut microbiota in these fecal samples was analyzed by next-generation sequencing methods. There were significant differences in the taxonomic composition of the microbiota (the top 10 most abundant taxa) between the young and elderly people in Korea, especially in terms of relative abundance levels of bacteria in phyla Firmicutes, Proteobacteria, Tenericutes, and Fusobacteria (P less then 001). The gut microbiota of young people contained higher relative abundance of Lactobacillus than did the microbiota of elderly people, while the microbiota of elderly people manifested higher relative abundance of Escherichia. Even though the sample size may not be large enough for this study to be representative of the entire population of Korea, the study still provides data that are suggestive of differences in the gut microbiota between young and elderly people in Korea. Furthermore, our findings may be applied to develop an improved age-based in vitro model of digestion of Koreans for future research.This study aimed to investigate the effect of a 12-week very low-carbohydrate, high-fat (VLCHF) diet and exercise on biomarkers of inflammation in healthy individuals. Since the anti-inflammatory effects of a ketogenic diet have been established, we hypothesized that the VLCHF diet, along with exercise, would have an additional favorable effect on biomarkers of inflammation. Twenty-four healthy individuals were allocated to the VLCHF diet (VLCHF N = 12, age 25.3 ± 2.0 years, body mass 66.7 ± 9.8 kg, fat mass 21.5% ± 4.9%), or habitual diet (HD N = 12, age 23.9 ± 3.8 years, body mass 72.7 ± 15.0 kg, fat mass 23.4 ± 8.4 %) group. Biomarkers of inflammation (adiponectin, leptin, and high-sensitive interleukin-6 [hs-IL-6]) and substrate metabolism (glycated hemoglobin, fasting glucose, triacylglycerides, and cholesterol) were analyzed from blood at baseline and after 12 weeks. The adiponectin-leptin ratio significantly increased in the VLCHF group after the intervention period (ES [95% CL] -0.90 [-0.96, -0.77], P ≤ .001, BF10 = 22.15). The adiponectin-leptin ratio changes were associated with both a significant increase in adiponectin (-0.79 [-0.91, -0.54], P ≤ .001, BF10 = 9.43) and a significant decrease in leptin (0.58 [0.19, 0.81], P = .014, BF10 = 2.70). There was moderate evidence of changes in total cholesterol (-1.15 [-2.01, -0.27], P = .010, BF10 = 5.20), and LDL cholesterol (-1.12 [-2.01, -0.21], P = .016, BF10 = 4.56) in the VLCHF group. https://www.selleckchem.com/products/mrtx1133.html Body weight (kg) and fat mass (%) decreased in the VLCHF group by 5.4% and 14.9%, respectively. We found that in healthy young individuals, consuming a VLCHF diet while performing regular exercise over a 12-week period produced favorable changes in body weight and fat mass along with beneficial changes in serum adiponectin and leptin concentrations. These data support the use of a VLCHF diet strategy for the primary prevention of chronic diseases associated with systemic low-grade inflammation.Vitamin D is a factor that regulates calcium and bone metabolism. However, the clinical effect of vitamin D on bone mineral density (BMD) remains controversial. We hypothesized that sufficient vitamin D is required to maintain optimal BMD in adolescents. Based on the Korea National Health and Nutritional Examination Survey, data of 1063 adolescents aged 12 to 18 years were analyzed. The association of vitamin D status and other variables, such as body mass index (BMI), calcium intake, physical activity, lean mass, and fat mass, with BMD Z-scores in the lumbar spine, whole body, total femur, and femur neck were examined. We defined vitamin D deficiency as 20 ng/mL according to the 25-hydroxyvitamin D (25-OHD) level. The mean 25-OHD concentration of subjects was below normal, at 16.28 ng/mL. Subjects with vitamin D deficiency, insufficiency, and sufficiency comprised 20.5%, 58.6%, and 20.9% of all subjects, respectively. The vitamin D sufficient group had higher BMD Z-scores compared to the insufficient group, and the insufficient group had higher BMD Z-scores compared to the deficient group. In linear regression analysis, 25-OHD level, BMI, calcium intake, physical activity, lean mass, and fat mass were positively associated with BMD Z-scores. 25-OHD level was positively associated with BMD Z-scores, even after adjusting for other factors. This study suggests that vitamin D status is positively associated with BMD in adolescents; therefore, maintaining sufficient vitamin D levels during adolescence is crucial to prevent low BMD.Adolescent internalizing problems such as anxiety and depression have been associated with subsequent educational underachievement. However, it has not been investigated if the association is accounted for by neurodevelopmental disorders (NDDs, i.e., attention-deficit/hyperactivity disorder, autism spectrum disorder, developmental coordination disorder, tic disorder, learning disorder). This study is the first to describe the relationship between internalizing problems at age 15 and educational outcomes in later adolescence while controlling for a wide range of NDDs in childhood, and applying a genetically sensitive design. We used the nation-wide population-based Child and Adolescent Twin Study in Sweden, comprising 4997 fifteen-year-old Swedish twins born between 1994 and 1998. Internalizing problems and NDDs were measured with parental report. Educational outcomes were merit rating and upper secondary education eligibility, retrieved from the National School Register. Internalizing problems at age 15 were found to be negatively associated with educational outcomes in later adolescence. Additive genetics accounted for 89% of the covariation between internalizing problems and merit rating, out of which roughly half were unique genetic effects of internalizing problems and the remaining half due to NDDs. In conclusion, internalizing problems form an important risk factor for subsequent educational underachievement, going beyond the risk conferred by childhood NDDs.
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