Healthy Diet Linked to Longer Life: UK Study Reveals Best Eating Plans

A large, long-term study conducted in the United Kingdom involving over 100,000 men and women suggests that adopting a healthy dietary pattern can contribute to a longer life, though the extent of that benefit varies depending on the specific diet. Participants were followed for approximately ten years.

The study, published in Science Advances, utilized data from the UK Biobank. The average age of participants was around 58 years. Individuals with pre-existing cardiovascular disease or cancer were excluded from the analysis. All participants meticulously recorded their food and beverage intake over multiple 24-hour periods, allowing researchers to calculate average dietary patterns.

Five Dietary Models Compared

Researchers examined five dietary approaches: the Alternate Healthy Eating Index (AHEI), the Alternate Mediterranean Diet (AMED), the healthful Plant-based Diet Index (hPDI), the Dietary Approaches to Stop Hypertension (DASH) diet, and the Diabetes Risk Reduction Diet (DRRD). All emphasize a high intake of vegetables, fruits, whole grains, and limited added sugars. Differences lie in their specific focuses: the Mediterranean diet highlights fish and olive oil, DASH was designed to lower blood pressure, and the DRRD prioritizes fiber-rich foods and those with a low glycemic index.

Up to 24 Percent Lower Risk of Mortality

Over the roughly ten-year observation period, 4,314 deaths were recorded. Higher scores on each of the dietary models were associated with a lower risk of mortality. Adhering to a healthy diet – depending on the model – was linked to an 18 to 24 percent reduction in the risk of death compared to less healthy eating patterns.

Men: DRRD Appears to Offer the Greatest Benefit

Among men, the DRRD demonstrated the most pronounced effect. At age 45, men with the least healthy diets had a statistical life expectancy of approximately 34 years. Those with the highest DRRD scores had a life expectancy of around 37 years – an increase of roughly three years. Other dietary models were associated with an increase of approximately two to nearly three years in life expectancy.

Women: Mediterranean Diet Takes the Lead

For women, the Alternate Mediterranean Diet showed the greatest benefit. At age 45, women with the least healthy diets had a life expectancy of approximately 37 to 38 years. Those with high scores on the Mediterranean diet gained about two additional years of life. The remaining dietary models generally provided an increase of between one-and-a-half to just over two years.

It’s important to note that this was an observational study. It reveals statistical associations but does not prove direct causation. However, the large number of participants and the extended observation period lend significant weight to the findings.

The study authors emphasize that consistently following any of several well-established healthy dietary patterns can meaningfully extend life expectancy—potentially adding 1.5 to 3.0 years of life from mid-life onward. These benefits were observed regardless of genetic predisposition to a shorter lifespan, suggesting that diet can help offset inherited risk.

While genetics play a role – individuals predisposed to a shorter lifespan were found to be 21% more likely to die early – dietary choices remain a powerful modifiable factor. The research suggests that even those with a genetic predisposition to a shorter life can benefit from adopting a healthier eating pattern.

The findings reinforce the well-established link between diet and overall health and longevity. A dietary pattern rich in whole grains, fruits, vegetables, and plant-based foods appears to be particularly important in supporting a longer life. Reducing intake of added sugars is also a key component of these beneficial dietary approaches.