Fasting for 36 hours has become a popular online trend, often described as a way to “reset” the body. Supporters claim it helps metabolism, mental clarity, and overall health, but the reality is more nuanced than many viral posts suggest.

The basic idea behind fasting is that when food intake stops, the body first burns available glucose. It then uses stored glycogen before gradually shifting toward burning more fat for energy.

During longer fasts, the body may enter ketosis, a state where fat becomes the primary fuel source. Some proponents also highlight autophagy, a natural cellular cleanup process that may increase when nutrient intake is reduced.

Some people report feeling lighter, more focused, or less bloated during extended fasts. Others, however, experience fatigue, irritability, or difficulty concentrating. Individual responses vary widely based on health, lifestyle, and prior eating habits.

Extended fasting is not without risks. Dizziness, headaches, dehydration, low energy, and electrolyte imbalances can occur, especially if fluids and nutrients are not managed properly.

Fasting can be particularly risky for people who are pregnant, have diabetes, low blood pressure, a history of disordered eating, or who take medications affecting blood sugar or blood pressure.

For those interested in fasting, experts generally recommend starting gently, prioritizing hydration, getting adequate sleep, and avoiding intense physical activity during the fast. Consulting a healthcare professional is especially important before attempting longer fasts.

Ultimately, the most reliable “reset” does not come from extreme measures. Consistent balanced meals, regular movement, good sleep, and sustainable habits remain the foundation of long-term health.