How long do I have to fast to get into fat-burning mode? It begins after having fasted for sixteen hours straight. If you fast just by skipping lunch, you’re certainly working your fasting muscle, but you’re not yet in the fat-burning zone. What is autophagy and when does it start? The word autophagy derives from the Greek “auto” (self) and “phagein” (to eat). The word literally means “to eat oneself.” This is the body’s way of getting rid of all the broken-down, old cell parts that don’t serve the body. It’s different for everyone, but it starts after twenty-four to thirty-six hours of not
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