The specific case is this, spinach has oxalic acid in it, and if you cook it together with tofu, it can make the calcium and iron and other nutrients in the tofu to be eliminated. However, if you cook spinach for 2 minutes, 80% of the oxalic acid in spinach can be removed, and then add tofu at this time, there is no problem. Even if spinach and tofu are cooked together at the same time, it is only said that the loss of nutrients, and it will not affect the human body in any way, therefore, you can feel free to eat.