Healthline asked that question to David C. Nieman, DrPH, FACSM, a professor of health and exercise science and director of the Human Performance Laboratory at Appalachian State University in North Carolina, where he studies athletes and diet.
Nieman is a vegetarian and marathon runner who sees many reasons someone would want to become vegan. Still, he had a clear answer: No.
“The only possible way it [a vegan diet] may help some people is if they’re involved in a sport that takes more than an hour,” Nieman stated.
“And that’s only if they were on a low carb, high fat diet and switched to a vegan diet, which would mean they’d be taking in more carbs. Those people would see improvement in endurance not sports skill,” he said.
Studies on the correlation between performance and vegan, vegetarian, and meat-eating diets are rather limited.