Combine the right types of foods. Combining certain plant-based proteins will give you a complete protein. Aim to consume a variety of whole grains, nuts and legumes â these foods together will provide all the essential amino acids your body needs to make a complete protein.1  Combine legumes and whole grains for a complete protein.ombine the right types of foods. Combining certain plant-based proteins will give you a complete protein. Aim to consume a variety of whole grains, nuts and legumes â these foods together will provide all the essential amino acids your body needs to make a complete protein.