30-Day Food Fast: What Happens When You Stop Eating?

  • Malnutrition. When you don’t eat, your body doesn’t get the nutrients it needs to function properly. This can lead to a range of problems, including fatigue, weakness, hair loss, and impaired cognitive function.
  • Gallstones. Fasting can increase your risk of developing gallstones, which are small stones that form in the gallbladder. Gallstones can cause pain, nausea, and vomiting.
  • Muscle loss. When you don’t eat, your body starts to break down muscle for energy. This can lead to weakness, fatigue, and decreased physical performance.
  • Dehydration. Fasting can lead to dehydration, which can cause fatigue, lightheadedness, and confusion.
  • Heart problems. Fasting can put a strain on your heart, especially if you have any underlying heart conditions.
  • 0-8 hours: Your body will continue to digest your last meal.
  • 8-12 hours: Your blood sugar levels will start to drop.
  • 12-16 hours: Your body will start to break down stored glycogen for energy.
  • 16-24 hours: Your body will enter ketosis, a metabolic state in which it burns fat for energy.
  • >24 hours: Your body will start to break down muscle for energy.

If you’re considering a shorter fast, such as a 24-hour or 3-day fast, the risks are generally lower. However, it’s still important to talk to your doctor before fasting, especially if you have any underlying health conditions.