Bitter melon is the best of the vegetables, not only contains more nutrients, and colorful, so many people just stir-fry bitter melon or with other meat and vegetarian food together. In fact, the bitter melon in the oxalic acid is objective, no matter how you burn method, if you did not remove the oxalic acid in advance, as usual, will eat bitter melon when the oxalic acid into the body. Oxalic acid may also bind to calcium in other foods in the digestive tract and prevent the calcium from being absorbed. Oxalic acid may also enter the blood system after digestion and absorption and then combine with calcium in the blood, wasting calcium that has already been absorbed by the body. The correct way to eat bitter melon (including water spinach, bamboo shoots and bamboo shoots, which contain a lot of oxalic acid) is to scald it in boiling water for 1 to 2 minutes, so that the oxalic acid can be dissolved in the boiling water, and then fish out the bitter melon with the oxalic acid removed, so that it will not interfere with the absorption of calcium as you cook it, including cooking tofu.