9. Hemp Seed
Hemp—yes, the stuff related to marijuana—is an endlessly useful plant, and its seeds are no exception. Hemp seed (often sold as a protein powder) is not only rich in protein, but also packs healthy omega-3 and omega-6 fatty acids, which have been shown to have a number of healthy benefits. Bonus: It’s highly digestible, making it a great vegetarian alternative to guys who have trouble digesting whey.