Mediterranean diet trials show modest blood-sugar improvements in diabetes
A pooled analysis found improvements in blood-sugar measures and body mass index, while the systolic blood-pressure result remained statistically uncertain.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Among adults with type 2 diabetes, Mediterranean diets produced modest average improvements in blood-sugar markers and body mass index compared with other diets. Some cardiovascular risk markers also improved, but the estimate for systolic blood pressure included no difference. These results describe measured risk factors, without establishing fewer diabetes complications or cardiovascular events.
The abstract does not give participant totals, follow-up ranges or details of the control diets. The authors call for larger trials with standardized methods and longer follow-up.
What researchers found
Mean difference in HbA1c
Mediterranean versus non-Mediterranean diets; follow-up durations not reported. This is an absolute difference on the HbA1c percentage scale.
What the trials measured
The review combined randomized trials of Mediterranean diets, including culturally adapted interventions. Its main outcomes were glycated hemoglobin, fasting glucose and body mass index, with cholesterol and blood pressure assessed separately.
Blood-pressure results were uneven
The systolic blood-pressure estimate favored Mediterranean diets, but its confidence interval crossed zero. That leaves uncertainty about this outcome; it should not be grouped with the clearer reductions in diastolic pressure and LDL cholesterol.
The original publication
Impact of the Mediterranean Diet on Glycemic Control, Body Mass Index, Lipid Profile, and Blood Pressure in Type 2 Diabetes: A Meta-Analysis of Randomized Controlled Trials.
Wu MJ, Hung CH, Yong SB et al.
Nutrients · 2025
- PubMed ID
- 41470853
- Record checked
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