Question

multiple choice question
which class of nutrient is our chief dietary source of nitrogen?

lipids

carbohydrates

proteins

minerals

Explanation:

Lipids are mainly fats/oils, no significant nitrogen. Carbohydrates are C, H, O, no N. Minerals are inorganic, no N. Proteins are made of amino acids, which contain nitrogen (e.g., amino group -NH₂). So proteins are the chief dietary N source.

Answer:

C. Proteins