This is called nitrogen balance: a comparison between ingested protein nitrogen and lost.
In adulthood, and if our diet, health and the normal balance of nitrogen is balanced, that is, revenue equal to the losses.
During childhood, when we grow in pregnancy and lactation period, or when one of the athletes want to increase their strength or lean muscle Ripped Muscle X mass inflation, positive nitrogen balance, which indicates that the entry of nitrogen is higher than the loss should occur.
It indicates negative nitrogen losses greater than the gains balance. This occurs when the protein a day and the poor.
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