Which dietary category is recommended at 15% of the diet?

• A. Vegetables and fruits
• B. Protein
• C. Dairy
• D. Fats and oils

Answer: (B)

The idea being tested is how energy from food is distributed among the macronutrients, with protein commonly set around 15% of daily energy. Proteins supply amino acids for growth, tissue repair, and enzymes, so guidelines aim for enough protein without using up too much of the daily energy budget. If you take a typical 2000 kcal/day diet, 15% from protein equals about 300 kcal, which is roughly 75 grams of protein (since protein provides 4 kcal per gram). Vegetables and fruits are important for vitamins, minerals, and fiber but aren’t described by a fixed energy percentage in these guidelines. Fats and oils usually contribute a larger share of energy, often around 25–35%, not 15%. So the best fit for 15% of the diet is protein.