CATEGORY: HEALTHY AGING & LONGEVITY
Adults who ate a higher-quality diet through their middle years were substantially more likely to reach age 70 in good health — free of major chronic disease and with sound memory, mobility and mental health — than those whose diets scored lowest, a study that followed more than 100,000 people for up to 30 years found. Because it tracked people’s own eating habits rather than assigning diets, it shows an association, not proof that diet alone determines how we age.1
How the Study Worked
Researchers followed 105,015 U.S. nurses and other health professionals, on average in their 50s at the start, who completed detailed diet questionnaires every few years from the 1980s onward. They scored each person against eight established eating patterns and tracked who, up to 30 years later, met a strict definition of “healthy aging”: living to at least 70 without any of 11 major chronic diseases and with intact cognitive, physical and mental health. Only about 1 in 11 participants cleared that full bar, which made the differences between diets easier to see.
What the Numbers Showed
The pattern tied most strongly to healthy aging was the Alternative Healthy Eating Index, a measure of overall diet quality. People whose diets scored in the top fifth had about 86% greater odds of aging well — nearly twice the odds — compared with those in the bottom fifth. All eight of the healthy patterns pointed in the same direction, while diets higher in ultra-processed foods were linked to lower odds of healthy aging.1
What the Diet Looked Like
The top-scoring pattern was not built around any single “superfood.” It leaned on vegetables, fruits, whole grains, nuts, legumes and healthy fats such as olive oil, with less room for red and processed meats, sugary drinks and heavily salted foods. In other words, it reflected an overall way of eating rather than one rule — and the researchers found no single food that explained the benefit on its own.
What This Does and Doesn’t Mean
Because people chose their own diets, the study can’t prove that eating this way causes healthier aging, and those with better diets may differ in other ways, such as exercise or income. What it adds is unusually long-term evidence linking everyday diet quality in midlife to a fuller kind of health decades later — not simply a longer life, but more years free of disease and disability.
Key Takeaways
- In a 30-year study of more than 100,000 people, those with the highest-quality midlife diets had about 86% greater odds — nearly double — of reaching 70 free of major disease and mental and physical decline.
- The link came from an overall pattern rich in vegetables, fruits, whole grains, nuts, legumes and healthy fats, not any single food; diets high in ultra-processed foods were linked to lower odds.
- This was an observational study, so it shows an association, not proof that diet alone shapes how you age.
- If you’re thinking about changes to how you eat, your healthcare provider or a registered dietitian can help you find a pattern that fits your health and preferences.
References
- Tessier AJ, Wang F, Korat AA, et al. Optimal dietary patterns for healthy aging. Nature Medicine. 2025;31(5):1644–1652. link