This naturally Gluten Free grain is a source of fiber as well as monounsaturated fats, similar to those found in avocado and olive oil.  Amaranth also takes the title for the grain richest in protein, with some 28g per 100g, making it ideal for a vegetarian diet. Amaranth also has an impressive level of nutrients as its rich in magnesium, iron, manganese, folate and vitamin B6.