Published in Health and Wellness
Mediterranean diet boosts endurance exercise within days

In a small study published in the Journal of the American College of Nutrition, Researchers found that participants ran a 5 km 6% faster after eating a Mediterranean diet than after eating a Western diet. They found no difference between the two diets in performance in anaerobic exercise tests.

The Mediterranean diet includes whole fruits and vegetables, nuts, olive oil and whole grains, and avoids red and processed meats, dairy, trans and saturated fats and refined sugars.

By comparison, the Western diet is characterized by low intake of fruit, vegetables and unrefined or minimally processed oils and high intakes of trans and saturated fats, dairy, refined sugars, refined and highly processed vegetable oils, sodium and processed foods.

Senior researcher Edward Weiss, Ph.D., professor of nutrition and dietetics at SLU, says the Mediterranean diet is well-established as having numerous health benefits. He and his team hypothesized that the diet's anti-inflammatory and antioxidant effects, more alkaline pH and dietary nitrates might lead to improved exercise performance.

"Many individual nutrients in the Mediterranean diet improve exercise performance immediately or within a few days. Therefore, it makes sense that a whole dietary pattern that includes these nutrients is also quick to improve performance," Weiss said. "However, these benefits were also quickly lost when switching to the Western diet, highlighting the importance of long-term adherence to the Mediterranean diet."

The study enrolled seven women and four men in a randomized-sequence crossover study. The participants ran 5 km on a treadmill on two occasions — once after four days on a Mediterranean diet and on another occasion after four days on a Western diet, with a period of nine to 16 days separating the two tests.

Weiss says the study found the 5 km run time was 6% faster after the Mediterranean diet than the Western diet despite similar heart rates and ratings of perceived exertion.

"This study provides evidence that a diet that is known to be good for health is also good for exercise performance," Weiss said. "Like the general population, athletes and other exercise enthusiasts commonly eat unhealthy diets. Now they have an additional incentive to eat healthy."

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