@health_explaining: During the first 48 hours without food, your body doesn’t simply “shut down.” Instead, it switches through a series of carefully regulated metabolic changes to keep your organs supplied with energy. At first, it uses glucose circulating in the bloodstream and stored glycogen in the liver. As these reserves become depleted, the body increasingly turns to stored fat for fuel. By around 24 to 48 hours, fat breakdown accelerates and the liver begins producing ketones, an alternative fuel that can be used by the brain and other tissues. At the same time, insulin levels fall, while hormones such as glucagon and growth hormone help maintain blood sugar and preserve lean tissue. Your body also becomes more efficient at using its available energy stores during this period. Although these changes are a normal part of fasting, a 48-hour fast is not appropriate for everyone. People with diabetes, certain medical conditions, those who are pregnant, or individuals taking specific medications should not attempt prolonged fasting without medical guidance. For healthy adults, the body’s response reflects an impressive ability to adapt when food is temporarily unavailable. #biology #medicalstudents #tiktok #education #Medical

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Saturday 04 July 2026 05:28:26 GMT