Soybeans are a very rich source of plant-based protein and fat. What’s more, their high fiber content is good for your gut health. Soybeans are a good source of several vitamins and minerals, including vitamin K1, folate, copper, manganese, phosphorus, and thiamine. Soybeans are a rich source of various bioactive plant compounds, including isoflavones, saponins, and phytic acid. Isoflavones in particular mimic estrogen and are responsible for many of soybeans’ health effects. In some people, soy products may suppress thyroid function, cause flatulence and diarrhea, and lead to allergic reactions.