For how many days can a person survive without food?
A person can survive for around 30 days without any food, but after that it becomes difficult to completely avoid starvation mode.
The reason people can’t go extended periods of time without food has to do with lipid metabolism. When carb intake is reduced or absent, the body mobilizes fat stores and releases free fatty acids into the bloodstream. These released ketones provide energy by fueling cells in the brain and heart. The only major organ which doesn’t have a big enough fuel supply is skeletal muscle tissue. Commercially available MCT oil supplements offer an alternative source of energy for muscle tissues – addressing this depletion helps maintain cell health during times where calorie intakes are reduced or absent altogether.