Key Takeaways
- In 155,413 UK Biobank participants followed for a median of 11.6 years, the closest followers of the EAT-Lancet diet had 15–17% lower type 2 diabetes risk.
- Slower biological aging statistically accounted for about a third to two-fifths of that link.
- The study was observational, so it shows an association, not proof the diet prevents diabetes.
A planet-friendly plate, and a lower diabetes risk
People who ate closest to the EAT-Lancet planetary health diet had a 15 to 17 per cent lower risk of developing type 2 diabetes, according to a large prospective study published in Frontiers in Nutrition on November 11.
What the study found
Researchers followed 155,413 UK Biobank participants who were free of type 2 diabetes at the start, for a median of 11.6 years. During that time, 7,626 people developed the disease. Those whose diets most closely matched the EAT-Lancet pattern — more vegetables, fruits, whole grains, legumes, nuts and unsaturated oils, and less red meat, added sugars and refined grains — had a 17% lower risk by one scoring method and 15% lower by another, compared with those whose diets matched least. The study also looked at biological aging, measured from blood and clinical biomarkers. People with faster biological aging had more than double the diabetes risk, and slower biological aging statistically accounted for about a third to two-fifths of the diet's link with lower diabetes risk.
Keep the numbers in perspective
The absolute benefit was small: the modelled 10-year diabetes risk was 4.71% in the lowest-adherence group versus 4.04% in the highest — roughly seven fewer cases per 1,000 people over a decade. And this was an observational study, so it shows an association, not proof that the diet prevents diabetes. People who ate closest to the pattern also tended to be non-smokers, physically active, more educated and at a normal weight — differences that can confound the result even after statistical adjustment. The mediation finding is exploratory: the authors say the timing between diet and the biological-age measurements could not be firmly established. The participants were also 95.8% White and healthier than the general population, on average.
The Twikup Take
The pattern is consistent with what nutrition research keeps finding — a diet built around plants, whole grains and legumes tracks with lower diabetes risk — and the biological-aging angle is a genuinely interesting clue about why. But this is a long observational association, not a prescription, and the absolute difference for any one person is modest. This study observed eating patterns and health outcomes over time; it did not test a diet as a treatment. Diet changes should be discussed with a doctor or dietitian, especially for anyone managing blood sugar or taking diabetes medication. Image: Illustrative image.