The main source of protein in a vegetarian diet is often legumes, which include beans, lentils, and peas. These foods are rich in protein and serve as excellent substitutes for meat. Legumes not only offer a significant amount of protein but also provide essential nutrients such as fiber, vitamins, and minerals. Other important protein sources in vegetarian diets include nuts, seeds, tofu, tempeh, and dairy products (for lacto-vegetarians). Incorporating a variety of these protein-rich foods ensures that vegetarians can meet their nutritional needs while enjoying a diverse and balanced diet.