Short sleep duration (≤5 h) is independently associated with hypertension in young and middle-aged Korean adults.

Background: The present study explored the association between dairy food consumption and the risk of the metabolic syndrome in Korean adults using the most recent nationally representative data. Methods: The study sample comprised 4862 Korean adults ( ! 19 years) who participated in the fifth Korean National Health and Nutrition Examination Surveys. Dairy food consumption was assessed using a food frequency questionnaire. The metabolic syndrome was defined according to the joint interim statement of the International Diabetes Federation and the American Heart Association/National Heart, Lung and Blood Institute. Results: We found that the prevalence of the metabolic syndrome was significantly lower in subjects with higher milk or yogurt consumption (P < 0.0001). Adjusted odds ratios (ORs) for abdominal obesity and high fasting glucose were significantly lower among subjects in the highest ( ! once per day) than in the lowest (none or rarely) category of milk consumption after adjusting for potential risk factors [OR = 0.68, 95% confidence interval (CI) = 0.50-0.93, P for trend = 0.0314; OR = 0.82, 95% CI = 0.65-1.03, P for trend = 0.0233]. The adjusted ORs for lower highdensity lipoprotein cholesterol was 28% lower among subjects in the highest compared to subjects in the lowest category of yogurt consumption (OR = 0.72, 95% CI = 0.52-1.00, P for trend = 0.0197). Furthermore, higher consumption of milk or yogurt was found to be significantly associated with a lower risk of the metabolic syndrome (OR = 0.71, 95% CI = 0.55-0.93, P for trend = 0.0066; OR = 0.71, 95% CI = 0.48-1.05, P for trend = 0.0067). Conclusions: High intakes of dairy foods may be associated with a lower risk of the metabolic syndrome.

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This study investigated the associations of green tea, coffee, and caffeine consumption with self-report lifetime depression in the Korean population using data from the Korean National Health and Nutrition Examination Survey. In total, 9576 participants (3852 men and 5724 women) aged 19 years or older were selected for the present study. Green tea, coffee, and caffeine consumption levels were assessed with a validated food frequency questionnaire. Multivariate logistic regression analysis was used to determine the odds ratios (OR) and 95% confidence intervals (CIs) for depression according to green tea, coffee, and caffeine consumption. Frequent green tea consumers (≥3 cups/week) had 21% lower prevalence of depression (OR = 0.79, 95% CI = 0.63–0.99, p for trend = 0.0101) than green tea non-consumers after adjustment for potential confounders. Likewise, frequent coffee drinkers (≥2 cups/day) had 32% lower prevalence of depression (OR = 0.68, 95% CI = 0.55–0.85, p for trend = 0.0026) than coffee non-drinkers after adjustment for potential confounders. Also, participants in the highest quartile of caffeine consumption had 24% lower prevalence of depression than those in the lowest quartile (OR = 0.76, 95% CI = 0.62–0.92, p for trend = 0.0032). Frequent consumption of green tea, coffee, or caffeine was associated with a reduced prevalence of self-report lifetime depression in Korean adults. A prospective study and randomized clinical trials should be conducted to confirm the inverse relationships of green tea and coffee consumption with risk of depression.

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