A large Spanish clinical trial called PREDIMED-Plus followed nearly 5,000 adults at metabolic risk for six years. Participants who combined a calorie-reduced Mediterranean diet with moderate exercise and professional coaching were 31% less likely to develop type 2 diabetes compared to those following a standard Mediterranean diet alone. The intervention group also lost significantly more weight — 3.3 kg on average — and reduced waist circumference by 3.6 cm. Researchers estimated the program prevented roughly three diabetes cases per 100 participants. Published in Annals of Internal Medicine, this is one of the most rigorous nutrition trials ever conducted in Europe, offering strong clinical evidence that structured lifestyle changes can meaningfully delay or prevent one of the world's most common metabolic diseases.
