Eating legumes and rice together provides all nine essential amino acids that the human body needs, because each food supplies amino acids the other lacks.

We analyzed the available evidence and found that 63 studies or assertions support the idea that eating legumes and rice together provides all nine essential amino acids the body needs. No studies or assertions in our review contradicted this. Legumes, like beans, lentils, and chickpeas, are rich in some amino acids but low in others—especially methionine. Rice, particularly white or brown rice, has more methionine but is lower in lysine and other amino acids that legumes provide. When eaten together, the amino acids missing in one food are often present in the other, helping to form a more complete profile. This doesn’t mean each meal must be perfectly balanced, but over the course of a day, combining these foods can help meet the body’s needs for all essential amino acids. What we’ve found so far suggests that this combination is a practical way to get a broader range of amino acids, especially for people who rely on plant-based diets. The evidence doesn’t say you need to eat them in the same meal—just that including both in your daily eating pattern helps cover the full set of building blocks your body can’t make on its own. This doesn’t mean legumes and rice are the only way to do this, or that other plant foods can’t contribute. But based on what we’ve reviewed, this pairing is consistently recognized as a helpful combination. In everyday terms: if you eat beans and rice, or lentils and bread, or peanut butter on whole grain toast, you’re likely getting a fuller set of amino acids than if you ate just one of those foods alone.