Answer:
Measuring the amount of nitrogen consumed with the amount of nitrogen excreted.
Step-by-step explanation:
To determine if a person is in protein balance, we have to measure the amount of consumed nitrogen in relationship with the amount of excreted nitrogen. In other words, we have to check for a nitrogen balance. By checking the nitrogen balance, we can determine the protein balance because nitrogen is mainly in amino acids and proteins, which are large groups of amino acids. So, if there is an imbalance of nitrogen, there is an imbalance of proteins.