Extended fasting is powerful, but it’s not harmless. This article covers the most important fasting risks and downsides, backed by physiology, data, and real experience, to help you avoid common mistakes.

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.

How fast do ketones rise during fasting? In my 7-, 9-, and 10-day water fasts, I tracked how quickly I entered ketosis and what made the biggest difference. Turns out, movement early in the fast helps you reach deep ketosis faster — and burn more fat along the way. Here’s how glucose drops, ketones rise, and why fasting ketosis is totally different from dangerous ketoacidosis.

From my first 24-hour fast to a 9-day water fast — here’s how fasting reshaped my mindset, health, and confidence over 25 years.

Discover my personal 16:8 intermittent fasting routine — from early-morning workouts to strategic meal timing — and learn practical tips for handling hunger, staying flexible, and making IF a sustainable lifestyle.

Breaking an extended fast the right way is just as important as the fast itself. Learn what to eat, what to avoid, and how to reintroduce food safely — with a simple, science-backed refeeding guide.

Extended fasting is tough — but it doesn’t have to be torture. These 20 tips will make your next multi-day fast easier, safer, and more effective.

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.