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Well, yes. Basic daily activities, maintaining your internal body heat, and keeping your organs functioning all require energy. The only way humans can get that energy is through food or burning fat. So to keep living without food, you need to be burning fat

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You need to be careful not to lose weight too quickly, since that has risks of its own. It is a risk with extreme diets such as extended fasting.

Excessively fast weight loss can cause liver injury. Most obese people will already have some degree of fatty liver disease (NAFLD), and while gradual weight loss is beneficial in reversing that liver disease, excessively fast weight loss can have the opposite effect and promote liver disease progression.

Say why.

Not only is it throwing off hormone/endocrine production, the toxins that have been stored in the fat cells are all being filtered through the body at the time of breakdown.

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