Intermittent Fasting Problems and Solutions - Top 5

By Jason Fung, MD

There are many potential problems when you start with intermittent fasting. I cover the top 5 problems we see, including:

  • Headaches

  • Constipation

  • Diarrhea

  • Dizziness

  • Heartburn

  • Low and high blood sugar

Check out Dr. Fung's website at and blog at

Jason Fung, MD

Jason Fung, M.D., is a Toronto-based nephrologist (kidney specialist) and a world leading expert in intermittent fasting and low-carb diets.