Introduction. 1  If you were a single-celled organism and you lived in a nutrient-rich place, staying alive would be pretty straightforward. 2  However, odds are you are not an amoebaâgiven that you're using Khan Academy right nowâand things arenât quite so simple for big, many-celled organisms like human beings.
The daily niacin requirement varies with the number of calories burned daily (the energy expenditure) and the protein intake. One niacin equivalent equals 1 mg of preformed niacin or 60 mg of dietary tryptophan. Niacin can be synthesized in the body from the essential amino acid tryptophan.Tissues can form an average of I mg of niacin from 60 mg of tryptophan provided by dietary protein. Consequently a high-quality protein diet supplies substantial tryptophan for niacin synthesis.he daily niacin requirement varies with the number of calories burned daily (the energy expenditure) and the protein intake. One niacin equivalent equals 1 mg of preformed niacin or 60 mg of dietary tryptophan. Niacin can be synthesized in the body from the essential amino acid tryptophan.
Download. Niacin is a water-soluble B vitamin also known as vitamin B3. This means that niacin is not stored in the body. You need to eat foods rich in niacin every day.Niacin helps your body use fat, protein and carbohydrates from foods to make energy.Niacin helps over 200 enzymes (natural chemicals in the body) to function normally in your body by helping your body use other B vitamins, and make DNA.ownload. Niacin is a water-soluble B vitamin also known as vitamin B3. This means that niacin is not stored in the body. You need to eat foods rich in niacin every day.