Examples of foods that are rich in amino acids include eggs, animal protein, legumes, grains, nuts and seeds. Quinoa is one of the few plant sources that contains a full balance of amino acids, according to About.com.
An egg has nearly the perfect balance of essential amino acids, reports About.com. Most animal proteins also have all the amino acids. Plant-based sources contain high amounts of some amino acids and low amounts of others. Therefore, people consuming a plant-based diet are advised to eat a mixture of protein sources in order to get the right balance of amino acids. Beans with rice is a classic vegetarian combination that provides a full range of amino acids.
Other good plant source combinations are lentils and almonds, beans with a corn tortilla, or whole wheat toast with peanut butter, states About.com. Another idea is bean soup with whole grain crackers. Additionally, soy is a complete protein and supplies the body with the essential amino acids. When choosing animal proteins, it is important to pick sources that are low in saturated fats and prepared with healthy methods. It is best to choose lean meats such as chicken and fish over red meat, and avoid fried foods.