Amaranth is widely mistaken for a grain—it's actually a seed, says Real Simple. It's a mild, slightly nutty-tasting pseudocereal that can be boiled to be used in lieu of rice or quinoa, or ground up into flour for baking. It's gluten-free and rich in both iron and protein, making it a healthy addition to any diet. According to Healthline, it could potentially help you lower your cholesterol or lose weight.