The Summary
Researchers conducted a systematic review of 52 studies to compare how the Mediterranean diet, ketogenic diet (VLCKD), and intermittent fasting affect testosterone levels in obese men. The findings revealed that the very-low-calorie ketogenic diet (VLCKD) yielded the most robust and consistent improvements in total testosterone, raising levels by 1.5 to 3.0 nmol/L. Intermittent fasting showed potential but inconsistent results, while the Mediterranean diet lacked strong evidence for hormonal restoration. Across all diets, weight loss was a key driver, with every 10-kilogram loss translating to a 3 nmol/L testosterone increase.
Why this is interesting
For men with obesity-related low testosterone, lifestyle changes are the first line of defense, but choosing the right diet has long been guesswork. This study clarifies the landscape, showing that keto-style diets may offer the fastest hormonal recovery, likely due to rapid weight loss and insulin improvements. For readers, this means that while the Mediterranean diet is excellent for overall heart health, those specifically targeting testosterone recovery might find superior, faster results by adopting a structured ketogenic approach or focusing heavily on overall weight loss milestones.