Kelp and wax gourd are best for soup. If you like to eat broad beans, you can also add a little to the soup. Broad beans are rich in crude fiber and other effective nutrients, which can help soup to lose weight more effectively. Saponins in kelp tofu can inhibit fat absorption and prevent the generation of peroxide in arteriosclerosis. However, saponin can cause iodine deficiency in human body, and kelp is rich in iodine necessary for human body (24g iodine per100g kelp). Because kelp contains more iodine, it can also induce goiter. When eaten together, the saponin in tofu can be discharged more, and the iodine in the body can be in a balanced state.