What’s the bottom line?

Running performance depends on many factors, and finding the diet that works best for you may take some experimentation.

Given the evidence, it seems that fasting for more than 10 to 12 hours or skipping a meal before a training session won’t make you a better runner. While strategically planning a fasted training before an easy run while ensuring good nutrition around heavier sessions might get you closer to your personal best, fasted training response is individual and best done with the support of a qualified coach and registered dietitian to avoid reductions in performance and health.

Melissa Kazan, MSc, RD is a Registered Dietitian and Sport Nutritionist based in Toronto. She enjoys exploring trails and being active outdoors, as well as cooking gourmet meals with quality ingredients. Visit healthyme@melissakazan.com