Potatoes, purple potatoes, taro, corn and beans can be stewed together, because these foods are incompatible with each other and will not cause any adverse reactions when eaten together. They contain various vitamins, protein, trace elements and minerals needed by the human body, which complement each other and have the effects of clearing away heat and toxic materials, diuresis and detumescence, tonifying blood and qi, invigorating spleen and stomach, and enhancing human immunity.