Is the Mediterranean Diet Still the Healthiest Option?

A recent study published in Frontiers in Nutrition challenges a long-held belief, suggesting that the famous Mediterranean diet may no longer be the best all-round choice for health and weight management. Researchers found that a low-fat vegan diet outperformed the Mediterranean diet across several key health markers, including weight loss, inflammation reduction, and dietary acid load.

An unexpected nutrition front-runner

Long seen as the gold standard for heart health and longevity, the Mediterranean diet is built around vegetables, fruit, legumes, fish, olive oil, and moderate dairy. But when it was directly compared with a low-fat vegan diet, focused on whole plant foods such as beans, grains, leafy greens, and fruit, the vegan approach came out ahead.

In a 16-week controlled crossover study run by the Physicians Committee for Responsible Medicine, participants following the vegan diet lost an average of 6 kg. By contrast, those on the Mediterranean diet saw no meaningful change in weight.

Less inflammation, bigger impact

A major reason for the difference may be advanced glycation end-products (AGEs). These are harmful compounds linked to inflammation, oxidative stress, and insulin resistance. In the vegan group, AGEs dropped by 73 percent. The Mediterranean diet group showed no reduction.

AGEs are found mainly in animal-based foods, including meat and cheese, so reducing or avoiding them is a central feature of a plant-based approach. Dr Hana Kahleova, the study’s lead author, noted that avoiding dairy and oils, which are common in Mediterranean-style eating, can reduce AGE intake, making a low-fat vegan diet a stronger option for disease prevention and weight control.

The alkalising advantage

The researchers also highlighted the vegan diet’s alkalising effect as an added benefit. Animal-based foods increase the body’s dietary acid load, which is associated with inflammation and weight gain. In the study, only the vegan diet led to a significant reduction in overall acidity, independent of calorie intake.

This reduction in acid load may have wider benefits, including supporting a healthier gut microbiome, improving insulin sensitivity, and lowering the risk of chronic conditions such as type 2 diabetes.

No calorie counting, just results

What makes these findings especially compelling is that participants were not asked to restrict calories. They ate freely within their assigned eating pattern. The significant weight loss seen with the low-fat vegan diet happened naturally, simply by shifting towards low-fat, whole plant foods.

Why the vegan diet came out on top

In this study, the low-fat vegan diet delivered meaningful weight loss over 16 weeks; it sharply reduced harmful AGEs linked to inflammation and chronic disease; it lowered dietary acid load, which may support metabolic health; and it was associated with improvements in insulin sensitivity and gut health. The authors also note that a plant-based approach can be easier to sustain for some people, and may offer environmental and ethical benefits as a bonus.

Conclusion

The Mediterranean diet still has well-supported health benefits, but this study suggests a low-fat vegan diet could be a more powerful, more comprehensive tool for long-term health, weight management, and chronic disease risk reduction. If you are looking to reset your habits and take control of your health, the evidence here leans strongly towards a low-fat, plant-based approach.

“Eating vegan is a simple and delicious way to maintain a healthy weight and fight chronic disease.” -Dr Hana Kahleova.

References:

Kahleova, H., et al. (2024). A low-fat vegan diet versus a Mediterranean diet for reducing dietary advanced glycation end-products and body weight: A randomized crossover trial. Frontiers in Nutrition.

Sankaran, V. (27 June 2025). Vegan diet beats Mediterranean diet when it comes to jump-starting weight loss, scientists find. The Independent.

Physicians Committee for Responsible Medicine (PCRM). (2024). Low-Fat Vegan Diet Beats Mediterranean Diet for Weight Loss, Reducing Harmful Compounds.