If Your Fasting Insulin Is Above 10, Your Body Can't Burn Fat Between Meals

If you've been eating less and the body fat still isn't moving, the problem may not be your effort — it may be a hormone your doctor never tested. Insulin isn't just a blood sugar regulator. It's the body's primary fat storage signal, and when it's chronically elevated it biochemically prevents your fat cells from releasing stored fat, even during a fast. Dr. Fitz breaks down the exact mechanism, the supporting research, and the one lab value to request from your doctor that could explain why nothing is working.

What you'll learn in this video

  • How insulin suppresses the two enzymes responsible for releasing stored fat
  • Why a 2026 study found high fasting insulin caused subjects to burn muscle, not fat, during a fast
  • What randomized controlled trials actually show about low-carb vs. low-fat fat loss
  • Why alternate day fasting reduced fasting insulin by 52% while daily caloric restriction managed only 14%
  • The one lab value to request from your doctor that could explain why nothing is working
  • Why metabolic inflexibility sits at the root of so many chronic conditions