• A sports nutritionist focuses most of his workouts on running and resistance training. • He times his carb intake when he works out, opting for fresh sourdough and pasta. • He shared how he gets other nutrients, like protein and fiber, in addition to carbs.

Dr. Samuel Impey eats a lot of carbs. In fact, they're the backbone of his diet.

"I'm weirdly passionate about bread," Impey, a sports nutritionist who focuses on endurance performance and the former lead nutritionist for the British cycling team, told Business Insider. "But it has to be a really good, preferably pretty fresh sourdough."

Freshly baked bread is minimally processed, while some types, like whole wheat sourdough, offer additional nutrients like protein and fiber.

As a marathon runner and dad, Impey, 38, makes sure

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