Three Scenarios of Nitrogen Balance
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N-Equilibrium:

Nitrogen in = Nitrogen Out

The person is in a state of maintenance where their body is neither losing or gaining body protein.

Positive N-Balance

Nitrogen in > Nitrogen Out

The person is gaining body protein. Positive Nitrogen balance occurs during periods of growth, including pregnancy, with protein repletion therapy, and with weight lifting exercise that builds muscle.

Negative N-Balance

Nitrogen in < Nitrogen Out

The person is losing body protein. Negative nitrogen balance is an undesirable state that occurs with weight loss, traumatic injury and some illnesses.