Healthy eating patterns are linked to a longer life, regardless of genetic predisposition to longevity. Digest
Life expectancy gains have slowed in recent years, and diet remains a major, modifiable driver of chronic disease risk. Researchers used a large cohort from the United Kingdom (UK) to test whether people who more closely follow evidence-based "healthy diet" patterns live longer, and whether inherited differences related to longevity alter those links.
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In 103,649 UK Biobank adults, the researchers analyzed reported food intake from repeated 24-hour recalls, calculated diet-quality scores for each participant based on how closely their diet aligned with five established healthy eating patterns, and then tracked deaths through national registries. The five patterns examined were the Alternate Healthy Eating Index 2010, the Alternate Mediterranean Diet, the healthful Plant-based Diet Index, the Dietary Approaches to Stop Hypertension (DASH) diet, and the Diabetes Risk Reduction Diet (DRRD). They also calculated a longevity polygenic risk score, a genetic score that adds up the effects of several DNA variants linked to longer life, and examined how this genetic profile interacted with diet.
- Over a median follow-up of 10.6 years, 4,314 participants died. Compared with the lowest fifth of diet scores, those in the highest fifth had an 18 to 24% lower risk of death, depending on the specific dietary patterns.
- Translating these differences into life expectancy, men in the highest fifth gained about 1.9 to 3.0 additional years from age 45, and women gained about 1.5 to 2.3 years.
- A higher genetic score for longevity was linked to a 15% lower risk of death, yet the protective associations of a healthy diet were largely similar across genetic risk groups.
- The DRRD appeared especially beneficial among people with a lower genetic predisposition to long life.
The study results suggest that healthy eating confers advantages regardless of inherited predisposition to longevity. All five dietary patterns emphasize fruits, vegetables, and whole grains, which provide dietary fiber and antioxidant compounds that help reduce inflammation and support the gut microbiome. Fiber intake even showed the strongest link with a lower risk of death. The included dietary patterns also encourage nuts and other sources of unsaturated fatty acids that improve cardiometabolic health. By contrast, sugar-sweetened beverages, which were strongly linked to a higher risk of death, can lead to fat buildup in the liver, promoting insulin resistance and increasing the risk of diabetes and cardiovascular disease. Similarly, diets with a higher glycemic index contribute to repeated, rapid spikes in blood sugar that place added stress on the body's metabolic systems.
Because this was an observational study that relied on self-reported dietary intake assessed only at the beginning of the study, it cannot establish a causal relationship between diet and longevity. Still, the findings support that widely recommended healthy eating patterns may add meaningful years of life. In this clip, I share my approach to time-restricted eating, meal composition, protein sources, and my typical daily eating schedule.