As the body shifts to partial dependence on ketones for energy during prolonged fasting:

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During prolonged fasting, the body shifts to partial dependence on ketones for energy. This helps to conserve the body's lean tissue by utilizing stored fat as a source of energy instead of breaking down muscle tissue. When the body shifts to partial dependence on ketones for energy during prolonged fasting, it conserves its lean tissue in order to use it as sparingly as possible and instead use stored body fat as its primary fuel source. This is a survival mechanism to ensure that the body has enough energy to function during times of food scarcity.

As the Body Shifts to Partial Dependence on Ketones for Energy