Mediterranean Diet Adherence Linked to Lower Psychosocial Stress in Korean Baby Boomers

A group of researchers in Korea has put a question to a generation that is just now moving into old age: does what people eat have anything to do with how stressed they feel? Their answer, published in the journal Nutrition Research and Practice, is a cautious yes. Among 1,656 Korean adults, those who most closely followed a Mediterranean-style diet were less likely to report high psychosocial stress.

The backdrop is demographic. Korea's baby boomers, those born between 1955 and 1963, make up around 15% of the population, and they are aging into a country where overall life expectancy keeps rising while healthy life expectancy is declining. The authors argue that health behaviors in middle age shape quality of life later, which makes this group a useful place to look for habits that can be changed. Stress is part of that concern. Perceived stress has been tied to cognitive decline, cognitive impairment, and a higher risk of cardiovascular disease, and perceived psychosocial stress has been independently linked to a higher risk of stroke in adults.

The Mediterranean diet is built around legumes, nuts, fruits, vegetables, whole grains, olive oil, and fish, with moderate alcohol and little red meat or high-fat dairy. Earlier work has associated it with a range of health benefits, and the authors note that adopting it around retirement age may support healthy aging, possibly helping to prevent or ease depression and sustain cognitive ability. Some studies suggest it may also soften the impact of psychosocial stress on executive function, though the researchers say more work is needed. Diet and mental health, they note, influence each other in both directions.

The data came from the Korean Genome and Epidemiology Study, which includes adults aged 42 to 50 from urban and rural parts of South Korea. After excluding people with extreme daily energy intake and those who did not answer the questionnaires, the team had 1,656 participants, 889 of them men. Diet was assessed with a revised semi-quantitative food frequency questionnaire and scored with the MTDS, a Mediterranean diet score covering food groups such as fruits, vegetables, legumes, whole grains, fish, dairy, red meat, poultry, alcohol, and olive oil. Points were assigned by how often people ate each group each week, and higher totals meant closer adherence. The scoring was adapted to Korean eating: kimchi and pickles were left out of the food groups, while mushrooms and seaweed were counted.

Stress was measured with a Korean-language scale of 18 questions about recent physical and psychosocial experiences, each rated on a four-point scale, with higher scores meaning more stress. The researchers also collected age, body mass index, household income, education, smoking status, and physical activity, and analyzed the data with chi-square tests, analysis of variance, Duncan's post-hoc test, and logistic regression.

When participants were split into three groups by adherence, most characteristics did not differ much. One exception was that women in the highest group tended to be better educated. Men in the highest group had lower stress scores. Closer adherence went with eating more vegetables, whole grains, potatoes, fruits, legumes, and fish, and less red meat and dairy. In men, poultry and alcohol intake fell as scores fell; women showed no such pattern because their intake was similar across groups.

On the main question, the trend was consistent. Higher adherence was linked to a lower risk of high psychosocial stress, with a clear downward trend (P = 0.026 in women and 0.016 in men). Men with the highest scores had 41% lower odds of high stress than men with the lowest, and women had 39% lower odds.

The authors are explicit about limits. The study is cross-sectional, so it captures one moment and cannot show that diet reduces stress. Food intake was self-reported and open to recall and social desirability bias, stress was also self-reported, and residual confounding may remain. The researchers suggest that encouraging this diet among baby boomers could support healthy aging, and that future studies should test interventions that help people adopt and stick with it.