* Rice is high in the amino acid methionine, but low in lysine.

* Beans are high in lysine, but low in methionine.

When combined, rice and beans provide a complete protein profile, meaning they contain all the essential amino acids your body needs. This is because they complement each other by providing the amino acids that each lacks.

Here are some other examples of complementary proteins:

* Lentils and brown rice

* Chickpeas and quinoa

* Corn tortillas and black beans

* Peanut butter and whole-wheat bread

These pairings provide a complete protein profile, making them excellent choices for a balanced diet.