What percentage of an average person's diet is protein?

• A. 15-20%
• B. 10-15%
• C. 25-30%
• D. 5-10%

Answer: (A)

This item is about how much of daily energy typically comes from protein. In a usual diet, protein provides a moderate share of calories, commonly about a sixth of total energy. That means on a standard 2000 kcal daily intake, protein would contribute around 300 kcal, which works out to roughly 75–100 grams of protein per day (protein provides about 4 kcal per gram). This range sits within the broader guideline that protein should make up a portion of energy rather than a small or dominating share.

Understanding this helps explain why the 15–20% range is a good representative answer for an average person: it reflects everyday eating patterns while staying within the official acceptable range for protein intake (10–35% of energy). The other options describe amounts that are either lower than typical for most people or higher than what is usually observed in the general population, and would not match common dietary patterns.