What happens when people don't eat for three days?

The human body can survive without eating for three days and supplementing water, because if the human body does not drink water for 24 hours, it will be life-threatening due to severe dehydration. Because there are energy storage substances in the body, such as fat. The subcutaneous fat and visceral fat in the human body are used to store energy. After fasting for 24 hours, normal people first consume glycogen reserves in their bodies, so that their bodies can live normally. In the next 24 hours, glycogen is exhausted and the body begins to consume protein. At this time, the body is sleepy, weak, and anabolism is weakened. At this time, the body began to be weak and hypoglycemia. If we can't continue to eat, the body will start to consume the fat stored under our skin and internal organs. At this time, the body's immunity and energy consumption will drop, the body will start to move less, and the body temperature will drop. So not eating for three days will not endanger life, but it is not good for health.