The primary source of protein for vegetarians is generally legumes, including beans, lentils, and chickpeas. These foods are rich in protein and provide essential amino acids necessary for bodily functions. Other notable vegetarian sources include quinoa, nuts, seeds, soy products like tofu and tempeh, and dairy products for lacto-vegetarians. Including a variety of these protein sources helps ensure balanced nutrition and supports muscle maintenance, repair, and overall health. It's also important for vegetarians to combine different protein sources to achieve a complete amino acid profile.