Red quinoa, originally a staple of the Incas, has the highest protein content of all grains. Quinoa has a delicate flavour, crunchy texture and comes in many varieties including white, black and red. Red quinoa is also rich in essential minerals and vitamins and is gluten-free. According to the USDA National Nutrient Database, which provides a full nutrient profile, 1 cup of cooked red quinoa has 222 calories. Enjoy red quinoa in salads, soups or as a light, fluffy side dish.