Diet + exercise cuts depression 45%
A Seoul Economic Daily report summarized new research showing that combining healthy eating with regular physical activity was associated with roughly a 45% lower risk of developing depression. The coverage noted the combined effect was stronger than diet or exercise alone and framed it as a lifestyle pattern effect. (en.sedaily.com)
Eating well and staying active together were linked to a 45% lower likelihood of depressive symptoms in a study of 17,737 Korean adults. (mdpi.com) The study was led by Minseon Park of Seoul National University Hospital and published in *Nutrients* on March 13, 2026. It analyzed Korea National Health and Nutrition Examination Survey data from 2014, 2016, 2018, and 2020. (mdpi.com) Researchers scored diet with the Korean Healthy Eating Index, measured weekly physical activity, and defined depressive symptoms as a score of 10 or higher on the nine-question Patient Health Questionnaire, a standard screening checklist. They split participants into four groups based on whether diet quality and activity were above or below the median. (mdpi.com) Depressive symptoms were present in 4.6% of participants overall. The group with both higher diet quality and higher activity had about 45% lower odds than the group low on both, while the high-activity-only group saw a 26% reduction and the high-diet-only group showed no statistically significant link. (chosun.com) The strongest associations showed up in women and older adults. Women in the high-diet, high-activity group had a 52% lower risk, and adults ages 45 to 65 and 65 and older saw reductions of about 58% to 59%, while men and adults under 45 did not show a notable association in this analysis. (chosun.com) Depression is usually measured either as symptoms already present or as new cases over time, and this study looked at symptoms at one point in time rather than tracking who later developed the condition. That means it found an association, not proof that diet and exercise prevented depression. (mdpi.com) That caution matters because people with depression often eat differently, move less, or both, which can blur cause and effect in snapshot studies. The authors adjusted for other factors, but the paper still describes the results as cross-sectional, not causal. (mdpi.com) The broader evidence for exercise is stronger because it includes long-term and trial data. A 2022 *JAMA Psychiatry* meta-analysis found adults meeting basic activity guidelines had lower risk of future depression, and a 2024 *BMJ* review of 218 randomized trials found exercise reduced depression symptoms, with walking or jogging, yoga, and strength training among the more effective options. (pmc.ncbi.nlm.nih.gov) (bmj.com) Diet evidence has been less consistent on its own, which is why combined lifestyle patterns have drawn more attention. A 2023 *Nature Mental Health* briefing on a 287,282-person study said a favorable mix of healthy lifestyle factors was associated with lower depression risk even among people with higher genetic susceptibility. (nature.com) Park said the findings support pairing nutrition education with physical activity programs rather than treating them as separate habits. The paper’s central result was not that one food or one workout changed mental health, but that the combination tracked with lower depression scores. (chosun.com)
