Which two foods are commonly combined to create a complementary protein?

Rice and beans are a classic example of complementary proteins. This combination works well because rice is low in lysine but high in methionine, while beans are the opposite, being high in lysine and low in methionine. When these two foods are eaten together, they provide a complete protein profile, meaning they contain all the essential amino acids needed for the body's functions.

This concept is essential in vegetarian and vegan diets, where individuals may need to combine different protein sources to ensure they obtain all essential amino acids. Other combinations, such as lentils and rice, also serve this purpose, but in this case, rice and beans are the more commonly recognized pairing.

The other combinations presented do not provide the same complementary protein benefits. Pasta and cheese, while delicious, may not have the same amino acid balance. Fish and potatoes are also not a complementary protein combination and do not address the specific need for amino acid completeness that arises in vegetarian diets.