1. Chicken. Chicken is a relatively lean and low-calorie source of protein , Per 100g, Protein. 53.4g Carbs. 0g Fat. 6.2g 2. Beef Beef "Beef is a great source of iron," says Gans. "We just need to watch our portions. Per 100g Protein. 54g Carbs. 0g Fat. 11.1g 3. Salmon Salmon "Salmon is packed with omega-3 fatty acids, which are good for heart health," Per 100g, Protein. 26g Carbs. 0g Fat. 6g 4. Eggs Eggs "Eggs are one of the easiest, least expensive, most flexible forms of protein," raves Gans. " Per 100g, Protein. 13g Carbs. 1.1g Fat. 11g