What Happens to Your Nervous System After Day 3 of Fasting | Dr. Mandell

Many videos online claim that fasting for seven days with no food is the cure for inflammation, disease, weight gain, and metabolic problems. While fasting can absolutely be a powerful tool, extreme fasting is often misunderstood and poorly explained.

In this video, I break down the real physiology of fasting, what happens inside your body after the first couple of days, and why I would never recommend a seven-day fast for most people. We discuss insulin, cortisol, autophagy, muscle preservation, thyroid function, electrolyte balance, and the nervous system response to prolonged food deprivation.

You will learn why shorter, well-timed fasting strategies often provide better results with less stress on the body, how excessive fasting can push the body into survival mode rather than healing mode, and why many people feel worse or even gain weight after extreme fasts. This video is not anti-fasting. It is about understanding how the body actually works so you can make safer, smarter choices that support long-term health instead of short-term extremes.

If you have ever felt shaky, anxious, cold, fatigued, wired but tired, or mentally foggy during a fast, this video will help you understand why. Healing does not come from punishment. It comes from working with your physiology, not against it.

This video is for educational purposes only and is not medical advice. Always consult your healthcare provider before making major dietary or fasting changes, especially if you have underlying health conditions.