r/Water_Fasting • u/andtitov • 8h ago
Water Fasting Fasting vs exercise vs diet - Their unique benefits
Hey folks! I post a lot about fasting - I do think that fasting is a heavily undervalued tool in our health toolbox. But I wanted to address one common question I get - why do extended fasting (why suffer) if you can get the same benefits from exercise or diet?
Actually, not really - extended fasting has its own effects and benefits that are completely unique to fasting. Here is my list
- Deep ketosis up to 5-8 mmol/L - vs 0.1 on a normal diet and 0.5-2 on keto. Ketones act as signaling molecules affecting appetite, clarity, and energy
- Autophagy activation - 5x in animal studies after 48 hours and stronger and more continuous mTOR suppression than calorie restriction or exercise
- Gastrointestinal rest - digestive workload near zero vs 3-5 activations a day
- Metabolic switching - liver glycogen depleted after about 24 hours, forcing a full shift to fat and ketones
- Insulin suppression - drops 50-70%, and blood glucose stabilizes at 60-70 mg/dL
- Appetite recalibration - hunger peaks at 24-48 hours and then fades, helping separate real hunger from just habits
But to be fully objective, exercise dominates fasting for muscle gain and strength, VO2 max, bone density, and functional aging. The mortality data behind regular exercise is hard to beat. And diet covers what fasting never will - micronutrients, gut microbiome support, and long-term consistency So, fasting, diet, and exercise are not competing - they complement each other.
And again I do believe it's one of the most undervalued tools in our health toolbox 😊