Graphic simulation shows what happens to your body when you stop eating for 36 hours

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A 36-hour fast has gained traction online, often promoted as a way to “reset” the body. While advocates praise benefits like improved metabolism and sharper thinking, the truth is more complex than social media trends suggest.

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When a person stops eating, the body first uses circulating glucose for energy. After that, it taps into glycogen stores in the liver and muscles before gradually shifting toward burning fat.

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With longer fasting periods, the body may move into ketosis, where fat becomes the main energy source. Supporters also point to autophagy, a natural process in which cells remove damaged components, which may increase when food intake is limited.

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Some individuals report positive effects such as feeling less bloated, lighter, or more mentally focused during extended fasts. Others experience the opposite, including tiredness, irritability, or trouble concentrating, showing that reactions vary widely.

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There are real risks involved with prolonged fasting. Common issues include headaches, dizziness, dehydration, low energy, and imbalances in electrolytes, particularly if fluids and nutrients are not carefully managed.

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Extended fasting can be unsafe for certain groups, including pregnant individuals, people with diabetes or low blood pressure, those with a history of eating disorders, or anyone taking medications that affect blood sugar or blood pressure.

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Health experts usually suggest easing into fasting, staying well hydrated, sleeping enough, and avoiding intense exercise. Ultimately, lasting health comes not from extreme fasts but from balanced eating, regular activity, good sleep, and sustainable daily habits.