I’ve been doing intermittent fasting with weekly extended fasts of 30-70 hours since July of 2020. At that time, A1C indicated insulin resistance, with number high enough to qualify as “pre diabetic”. My GP said I could either go on insulin, which would cause weight gain, or lose weight. Then she recommended “The Obesity Code (The Wellness Code)” by Dr. Jason Fung, a Canadian nephrologist. Read it, started it, combined with sort-of Keto (eliminated gluten products and refined carbs, but did not keep to a strict limit on carbs), and have so far lost between 75 and 80 pounds. Need to lose 40-45 more. Big difference, though, was that almost immediately I started feeling better - less joint pain, more energy. My A1C numbers dropped to the “normal” range within 3 months. My cholesterol numbers dropped enough that I was able to eliminate both statin drugs from my regimen. Haven’t been able to eliminate the BP meds yet, but am hopeful that will come soon.