1 first of all, let's understand the important role of nitrogen in organisms. Nitrogen is one of the important elements in organisms, including protein, DNA and RNA. For human beings, it is very important to take a proper amount of protein to keep healthy, while protein contains nitrogen. Therefore, the human body needs to ingest a proper amount of nitrogen to maintain normal physiological functions.
However, taking too much nitrogen does not mean that the body can fully absorb and utilize it. In fact, the human body cannot directly absorb the nitrogen in food, but decomposes the nitrogen in food into amino acids and ammonia through the digestive system, and then transports it to the liver for metabolism through blood. The liver converts ammonia into urea, which is finally excreted through the kidney.
3. Why is the nitrogen balance zero? In fact, this does not mean that the body no longer needs to ingest or excrete nitrogen, but that intake and excretion have reached a balanced state. Just like a balance, one side is nitrogen intake and the other side is nitrogen discharge. Only when the two sides reach a balance can they maintain a healthy state.
Significance of zero nitrogen balance
The significance of 1 and zero nitrogen balance lies in measuring protein requirement of human body and evaluating protein condition of human muscle. Specifically, it refers to the equilibrium state between nitrogen intake and discharge, and intake and discharge are equal. Under the condition that the body does not ingest protein at all, protein in the body is still being decomposed and synthesized.
2. An adult man weighing 60 kilograms will excrete 3.2 grams of nitrogen every day, which is equivalent to 20 grams of protein. When protein is not ingested at all, the body will inevitably consume nitrogen, which is called necessary nitrogen loss. That is to say, an adult male weighing 60kg should take at least 20g of high-quality protein every day to maintain normal protein metabolism in the body.