Lean protein can be found in lean meats, such as chicken, turkey, and pork. Seafood, including fish, is also an excellent source of lean protein. Red meat is not recommended because of the high level of saturated fat and because it can trigger constipation.
If you don’t eat meat or don’t enjoy meat, remember that protein comes from many sources other than meat. Consider nuts, tofu, beans, and “vegetarian” foods, such as tempeh and texturized vegetable protein (TVP) to supplement your protein needs. Dairy products are also a source of protein, but they can cause constipation, so they should be used in moderation. If you are having difficulty eating, consider supplementing your diet with protein powder, which can be added to drinks, such as smoothies