In the world of grains, one grain stands apart, since it consists entirely of protein, fiber, and oils: flaxseed. Because it is essentially free of carbohydrates that increase blood sugar, ground flaxseed is the one grain that fits nicely into this approach (the unground grain is indigestible). Use ground flaxseed as a hot cereal (heated, for instance, with milk, unsweetened almond milk, coconut milk or coconut water, or soymilk, with added walnuts or blueberries) or add it to foods such as cottage cheese or chilis. You can also use it to make a breading for chicken and fish.
