Health 101: Phases of Fasting – Health Benefits and Bodily Changes

Fasting triggers distinct health benefits depending on the duration. Within the first 12 hours, the body depletes glycogen stores, lowers insulin levels, and begins shifting to fat-burning while improving insulin sensitivity. By 16 hours, fat oxidation accelerates, mild ketosis often begins, and many people notice reduced appetite and better blood sugar control. At 18 hours, ketone production increases noticeably, supporting brain function and mental clarity. Image source: Reddit
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