It is not recommended to eat crab with some special foods to prevent adverse effects on the health of the organism. As a rule, you should limit foods rich in tannins and purines when eating crabs: 1. Foods rich in tannins: tannins are easily combined with the proteins in crabs to form tannins, which are not easily digested and absorbed. If eaten for a long time may lead to the occurrence of diseases such as gastric stone disease. Usually foods rich in tannins are tea, black dates, hawthorn, persimmon, red tee, peach, etc.; 2, purine-rich foods: crabs contain a lot of purines, and if other purine-rich foods such as animal offal or drinks such as beer are consumed at the same time, it may increase the risk of developing gout; 3, other: Chinese food therapy considers crabs as cold foods, and cannot be eaten with cold foods. For example, watermelon, white radish, eggplant, etc. From a medical point of view, if you accidentally eat a small amount of the above-mentioned foods occasionally, there is no obvious harm, so there is no need to worry excessively, but you should be careful not to overdo it and eat frequently with it.