Clinical Nutritionist Practice Test 2026 - Free Practice Questions and Study Guide

Question: 1 / 400

Which of the following is a common source of incomplete protein?

Fish

Eggs

Legumes

Legumes are commonly recognized as a source of incomplete proteins because they do not contain all nine essential amino acids required for a complete protein profile. While legumes are rich in several amino acids, they are particularly low in methionine, one of the essential amino acids. This characteristic makes them an important dietary component, especially for individuals following vegetarian or vegan diets, but they must often be combined with other protein sources to ensure the intake of all essential amino acids.

On the contrary, fish, eggs, and cheese are complete protein sources, as they provide all the essential amino acids that the body cannot synthesize. This distinction highlights the unique nutritional role of legumes compared to animal-derived proteins, which typically offer a more balanced amino acid profile.

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Cheese

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