Which effect does dietary protein have on insulin levels?

• A. Decreases insulin
• B. No effect on insulin
• C. Causes a mild decrease in blood sugar
• D. Increases insulin

Answer: (D)

When you eat protein, certain amino acids act as signals that stimulate the pancreas to release insulin. Amino acids like leucine and arginine are particularly effective at prompting this insulin response. The result is an increase in insulin levels, which helps tissues take up amino acids and build protein, and also supports glucose uptake to some extent.

Protein foods don’t usually drive insulin as strongly as carbohydrates, but the insulin rise is real and important for protein synthesis. It’s also common for protein meals to trigger glucagon release as well, which helps maintain blood glucose, so blood sugar stays fairly stable rather than dropping.

That’s why increasing insulin is the best answer: dietary protein does raise insulin, even if the rise isn’t as large as with carbs.