Oxidation Window
A 15- to 16-hour fast provides several more hours inside the fat-burning window than an 11- to 12-hour fast. Meaningful fat oxidation typically begins about 10 to 12 hours after the last meal. The oxidation window begins after insulin fall…
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A 15- to 16-hour fast provides several more hours inside the fat-burning window than an 11- to 12-hour fast. Meaningful fat oxidation typically begins about 10 to 12 hours after the last meal. The oxidation window begins after insulin falls and the body shifts from recent meal glucose toward stored fat use. Early breakfast can interrupt the overnight fat-mobilizing process after it has already begun.