Proteins are known as the building blocks of life: In the body, they break down into amino acids that promote cell growth and repair. (They also take longer to digest than carbohydrates, helping you feel fuller for longer and on fewer calories—a plus for anyone trying to lose weight.) You probably know that animal products—meat, eggs and dairy—are good sources of protein; unfortunately, they can also be high in saturated fat and cholesterol. What you may not know is that you don’t need to eat meat or cheese to get enough protein. Here are 14 good vegetarian and vegan sources, and tips on how to add them to your diet today.