Protein provides which element in the body's chemistry?

Protein provides which element in the body's chemistry?

• A. Nitrogen
• B. Glucose
• C. Fatty acids
• D. Vitamins

Answer: (A)

Proteins provide nitrogen to the body's chemistry because amino acids—the building blocks of proteins—contain an amino group that includes nitrogen. This is why protein is the main source of nitrogen in the diet; carbohydrates (like glucose) and fats (fatty acids) are made up mostly of carbon, hydrogen, and oxygen and contribute little to nitrogen intake. Vitamins may have nitrogen in some of their molecules, but they aren’t a primary source of body nitrogen. Nitrogen is essential for making amino acids, nucleotides, and other vital compounds, and the body tracks nitrogen to balance growth and maintenance needs. When protein is used for energy, nitrogen is released and excreted, but the key point is that protein supplies the body's nitrogen pool.

Proteins provide nitrogen to the body's chemistry because amino acids—the building blocks of proteins—contain an amino group that includes nitrogen. This is why protein is the main source of nitrogen in the diet; carbohydrates (like glucose) and fats (fatty acids) are made up mostly of carbon, hydrogen, and oxygen and contribute little to nitrogen intake. Vitamins may have nitrogen in some of their molecules, but they aren’t a primary source of body nitrogen. Nitrogen is essential for making amino acids, nucleotides, and other vital compounds, and the body tracks nitrogen to balance growth and maintenance needs. When protein is used for energy, nitrogen is released and excreted, but the key point is that protein supplies the body's nitrogen pool.