According to the public health network, eating bananas can generally eat crabs in moderation to supplement the nutrients needed by the body. Banana is a common fruit, which is rich in dietary fiber, vitamins, potassium and other ingredients. Eating it can also have a laxative effect. Crab is a common aquatic product, which is rich in protein. There will be no adverse reaction when these two foods are mixed together. When eating bananas and crabs, it's best not to eat too much at once.