When the diet does not provide enough energy to meet the body's needs (e.g. consuming a very-low-calorie-weight-loss diet) body protein is used to provide energy.

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When there is not enough energy from food to meet the body's needs, the body will start breaking down its own protein (muscle tissue) to provide energy. This is why it is important to consume enough calories to meet your body's energy needs, especially if you are trying to lose weight. Consuming a very-low-calorie-weight-loss diet can lead to muscle loss and other negative health consequences.

When the Diet Does Not Provide Enough Energy to Meet