Persons who adopt a severe, prolonged fast are likely to have lower body fat and lean body mass at the end of the fast.

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During a severe, prolonged fast, the body uses stored fat as its primary source of energy once glycogen stores are depleted, leading to a reduction in body fat. Additionally, there can be a loss of lean body mass as the body may break down muscle tissue for energy, especially if the fast is not supplemented with adequate protein.

Persons Who Adopt a Severe, Prolonged Fast Are Likely to Have