Kale. ... Blueberries. ... Avocados. ... Leafy green vegetables. ... Sweet potatoes, Oily fish. Salmon, eggs, chicken, and venison are all excellent sources of protein. Chicken is a cheap and healthy meat. Eggs. Eggs are another source of protein that can easily be incorporated into a balanced diet. Try: Avocado. Swiss Chard. ... Garlic. ... Sprouts. ... Mushrooms. ... Kale. ... Spinach. ... Collard Greens.