As always, be sure to consult your doctor before making any dietary changes. With that said, he says, there are alternative fuels -- like something called ketone bodies. “You might find that you fatigue more quickly or that exercise seems harder than normal,” says Seattle-based nutritionist and Academy of Nutrition and Dietetics spokesperson Ginger Hultin, MS, RDN. Behavioral trials with more powerful interventions lasting ≥1–2 y, and feeding studies of ≥4 wk, will be needed to test the true efficacy of carbohydrate restriction and clarify mechanisms.
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