It seems almost everyone has a friend who regularly skips breakfast, eats one meal a day or even goes several days without food. What happens in the body when we fast, and what “breaks” our fast?
We talked to top researchers and practitioners and poured over publications to understand the physiology of fasting. We learned that the “fasting state” is actually a set of biological mechanisms activated when we stay below intake thresholds for macronutrients and calories. When we “break” our fast, we add back in normal intake thresholds. The longer we fast the more carefully we need to break our fast when we start eating again.