Proteins constitute the tissues of your muscles and various organs, ie, they’re the building blocks of the body and not primarily a source of energy.
HOWEVER, the body may use proteins as fuel when it runs out of carbohydrates, ie, when the glycogen stores are emptied.
The longer and more intense your training is, the higher the chance of protein being used for fuel in your body.
THIS IS WHY IT IS SO VERY IMPORTANT to replenish carbohydrates during long-distance and endurance type training and sports activities.
There is an optimal level of protein intake: ~ 1.5g / each kg of your body weight. Exceeding this limit will not substantially help you increase your muscle mass.
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