A healthy person starting with average body fat can live totally deprived of food for as long as six to eight weeks due to:

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Ketosis is a metabolic process that occurs when the body doesn't have enough glucose for energy, so it starts burning stored fat instead. This process produces ketones, which can be used as an alternative source of energy for the body and the brain. During prolonged fasting, the body enters a state of ketosis, which can help to preserve lean mass (muscle) and provide energy for vital functions. However, it's important to note that total deprivation of food for prolonged periods can be dangerous and should not be attempted without medical supervision.

A Healthy Person Starting with Average Body Fat Can Live