Protein is the unsung hero of metabolism boosters. Foods high in lean protein, such as chicken, turkey and fish, require more energy to digest, increasing calorie expenditure. Add these lean meats to your meals to not only satisfy your taste buds, but also give your metabolism a protein-rich boost. For vegetarians looking for lean protein options, a variety of plant-based sources are available. Vegetarians can easily meet their protein needs while enjoying a variety of delicious and healthy meals using foods like lentils, chickpeas, quinoa, tofu and Greek yogurt.