Here’s what happens if you go 100 hours without food. Let me break it down—hour by hour: 0 to 14 hours: Your insulin drops. Digestion finishes. That means you're switching into fat-burning mode and giving your gut a break. 16 to 17 hours: Autophagy kicks in. Your cells literally start cleaning and repairing themselves. Think of it as a cellular detox. At 24 hours: Your gut begins to heal. Intestinal stem cells start regenerating—so if you deal with bloating, gas, or acid reflux, you’ll start not