Your body will start breaking down fat and protein stores.
This is called ketosis. “After your body has used up most of your stored carbohydrates, [or] glycogen, it’s forced to start breaking down stored fats and converting them into ketone bodies,” Gorski says. But don’t worry, burning fat stores isn’t a bad thing, so long as you have fat to lose. However, Gorski thinks that breaking down muscle tissue, which can happen when your body doesn’t have carbs and fat to burn, is always a bad thing because it makes you weaker. Carbs spike insulin, which can lead to fat gain via caloric surplus, sure, but it also drives muscle production since it’s an anabolic hormone.
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