Real data on fasting weight loss vs fasting fat loss. See why early weight drops fast, how much fat you actually lose, and what happens after refeeding.

Extended fasting temporarily lowers testosterone, but research and real data show it rebounds during refeeding. Here’s how my levels changed across two multi-day water fasts and why fasting may actually support healthier long-term hormone balance.

Extended fasting can dramatically improve blood sugar regulation and insulin sensitivity. Here’s my real Dexcom CGM data and fasting results.

Extended fasting doesn’t just change your weight - it transforms your biomarkers. Over 10 months, my 9- and 10-day water fasts improved 8 out of 10 InsideTracker biomarker categories, especially Heart Health, Metabolism, and Inflammation. See how fasting biomarkers like ApoB, glucose, triglycerides, and hsCRP shifted before, during, and after fasting - and why proper refeeding makes all the difference.

I completed a full 7-day water fast and tracked everything: weight, fat, lean mass, glucose, ketones, HRV, sleep, and refeeding. If you’ve ever wondered what real 7-day fast results look like, here’s the detailed, data-backed breakdown.