What is the AMDR for protein intake in adults?

• A. 5-15%
• B. 10-35%
• C. 20-40%
• D. 5-25%

Answer: (D)

Protein intake is described as a share of total daily calories, because the body’s protein needs scale with overall energy intake and activity. The Acceptable Macronutrient Distribution Range for adults is about 10% to 35% of daily calories. This span ensures enough essential amino acids to maintain lean tissue, support enzymes and immune function, and meet metabolic needs, while still leaving room for carbohydrates and fats to supply energy and other nutrients. A lower range like 5%–15% would risk not meeting amino acid requirements and could compromise muscle maintenance, especially for active individuals or older adults. A higher upper range, such as 20%–40%, is more than most people need and could crowd out other macronutrients essential for balanced energy. Therefore, 10%–35% best fits typical adult needs and guidelines.