Mediterranean Diet for Weight Loss: What Trials Show
Last updated October 30, 2026
Short answer: A 2016 systematic review of five randomized trials lasting at least a year (998 adults with overweight or obesity) found the Mediterranean diet produced greater weight loss than low-fat diets and similar weight loss to low-carbohydrate and American Diabetes Association diets. Average loss in the Mediterranean groups ranged from 4.1 to 10.1 kg across trials. Blood pressure and cholesterol changes were similar to the comparison diets.
What the review looked at
The authors searched MEDLINE, EMBASE and the Cochrane Library for randomized trials of the Mediterranean diet in overweight or obese adults with at least 12 months of follow-up. Five trials with 998 people qualified. Four had a low-fat diet as the comparison, two a low-carbohydrate diet and one the American Diabetes Association diet.
| Compared with | Mediterranean diet | Comparison diet | Result |
|---|---|---|---|
| Low-fat diets | 4.1 to 10.1 kg lost | 2.9 kg gained to 5.0 kg lost | Mediterranean produced greater weight loss at 12 months or more |
| Low-carbohydrate and ADA diets | 4.1 to 10.1 kg lost | 4.7 to 7.7 kg lost | Similar weight loss |
The ranges are wide because the trials differ in people, settings and how the diets were taught. The review found the Mediterranean diet was generally similar to the comparison diets for blood pressure and cholesterol as well.
What this means in practice
- For people trying to lose weight, a Mediterranean diet did as well as other well-studied diets in these trials, and better than low-fat diets.
- The study type matters. These were trials in people trying to lose weight, which is different from observational studies of people who already eat this way.
How it compares with other approaches
In the DIETFITS trial, a healthy low-carbohydrate and a healthy low-fat diet produced similar weight loss at 12 months. In the trials of intermittent fasting, fasting did about as well as ordinary calorie cutting. Across these studies, the evidence points to adherence over the specific diet. See low-carb vs. low-fat and intermittent fasting.
Limits of this evidence
- The review is from 2016. Newer trials exist that are not covered here.
- Only five trials qualified, with 998 people in all.
- Studies define the Mediterranean diet in slightly different ways, so check the details of any plan you follow.
- Averages hide individual differences.
Related: lifestyle vs. GLP-1 weight loss and weight loss percentage calculator.
Sources
See how long reaching your goal weight could take with the eating pattern you choose.
Try the Free GLP-1 CalculatorMedical Disclaimer
This calculator is for educational and informational purposes only and does not provide medical advice, diagnose any condition, recommend or prescribe treatment, or guarantee results. Estimates are based on information you provide and published clinical-trial averages. Individual results can vary significantly.
Estimates are based on average outcomes reported in the STEP 1 (semaglutide) and SURMOUNT-1 (tirzepatide) clinical trials. Individual results can vary significantly and are influenced by factors such as dosage, diet, and adherence.
Do not start, stop, or change any medication based on the results of this calculator. Always consult a qualified healthcare professional regarding medications, treatment options, risks, side effects, and your individual health needs.