Cutting calories can be tempting if your goal is weight loss, but logging miles at a calorie deficit can have serious implications in the moment and in the long run.
) decrease the availability of glucose, says Volek. “They force the body to become very efficient at breaking down and utilizing fat for fuel. The more adapted you are at burning fat, the more efficiently you can, if you're not eating enough calories, use your fat stores. That spares breakdown of lean tissue and some of the negative effects.” Even the leanest among us have ample amounts of fat to use as fuel.
“Your metabolism will slow down,” says Volek. “Your thyroid, which produces the hormones that regulate the body's metabolic rate, levels will fall. You’re going to feel more sluggish because your body isn’t in the fight or flight mode, it's conserving energy because it senses that caloric deficit. If you're trying to train hard, you're going to feel quite awful.”
Not to mention, calorie restriction often leads to poor intake of essential vitamins and minerals such as iron, folate, or vitamin B12, which can lead to anemia and fatigue, says Trentcosta. “It may be associated with poor calcium and vitamin D intake along with drops in estrogen and testosterone secondary to calorie restriction,” she says. “This can lead to weaker bones that may more easily fracture in the face of intense workouts.
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