A Mostly Plant-Based Eating Pattern Linked to Lower Type 2 Diabetes Risk

CATEGORY: METABOLIC & BLOOD SUGAR

Adults who most closely followed a mostly plant-based way of eating were about 32% less likely to develop type 2 diabetes — a condition in which blood sugar stays too high because the body stops responding well to insulin — over roughly two decades than those who followed such a pattern least, a large UK study found. Because people were not assigned what to eat, this shows an association, not proof that the diet itself prevents the disease.¹

How the Study Worked

Researchers drew on the EPIC-Norfolk study, which tracked 23,722 adults in eastern England (average age 59) for about 19 years. At the start, each person completed a detailed food diary, and researchers scored how closely their usual diet matched the “planetary health diet” — a mostly plant-based pattern built around vegetables, fruits, whole grains, nuts and legumes (beans, peas and lentils), with smaller amounts of meat and dairy. Over the following years, new cases of type 2 diabetes were identified through medical records, blood-sugar (HbA1c) tests, and national diabetes registries, so the outcome did not rely on people remembering to report it.¹

What the Numbers Showed

People whose diets most closely matched the plant-forward pattern were 32% less likely to develop type 2 diabetes than those whose diets matched it least. The link held after the researchers accounted for other things that affect diabetes risk, such as age, body weight, physical activity and smoking — though, as with any observational study, unmeasured differences between people who eat this way and those who don’t could still play a role.¹

Why an Eating Pattern May Matter

A diet rich in vegetables, fruits, whole grains and legumes tends to be high in fiber — the part of plant foods your body can’t fully digest — which slows how quickly sugar enters the blood and helps the body manage blood sugar more steadily. Patterns like this are also linked to healthier body weight and lower inflammation (the body’s low-level “alarm” response), both of which are tied to how well the body handles insulin. The study looked at the overall pattern rather than any single food, so no one ingredient explains the result.

What This Does and Doesn’t Mean

This was an observational study, so it points to an association rather than cause and effect, and individual responses vary. It also focused on a broad way of eating, not on cutting out foods or hitting specific targets. What it adds is another piece of evidence linking a mostly plant-based pattern to lower long-term diabetes risk.

Key Takeaways

• In a 19-year UK study of nearly 24,000 adults, closely following a mostly plant-based eating pattern was linked to a 32% lower risk of type 2 diabetes.
• The outcome was tracked through medical records and blood-sugar tests, not self-report, and the link held after accounting for weight, activity and smoking.
• This is observational research, so it shows an association, not proof — and how any eating pattern affects your own health can differ.
• If you are thinking about changing how you eat, or you have questions about your blood sugar or diabetes risk, your healthcare provider can help you weigh what fits you.

References

1. Sowah SA, Imamura F, Ibsen DB, Monsivais P, Wareham NJ, Forouhi NG. The association of the planetary health diet with type 2 diabetes incidence and greenhouse gas emissions: Findings from the EPIC-Norfolk prospective cohort study. PLOS Medicine. 2025;22(9):e1004633. link