As pineapple contains bromelain, organic acids, glycoside organics and other substances, direct use will be astringent, mouth numbness and other uncomfortable symptoms, so you need to soak pineapple into salt water to reduce or remove these three substances. Pineapple is a common fruit, which is rich in sugar and dietary fiber, vitamin A, bromelain, organic acids, glycoside organics, B vitamins, vitamin C and calcium, potassium and other substances, moderate consumption can be supplemented with nutrients needed by the body. However, pineapple contains bromelain, organic acids, glycoside organic substances, these three substances in direct contact with the tongue and lips may stimulate the mucous membrane of the skin, appearing astringent, numbness and other phenomena. Eating pineapple can choose to soak in salt water, can be in the shortest possible time to reduce the pineapple in the pineapple bromelain, organic acids, glycosides and other substances, to avoid the phenomenon of astringency, numbness. When consuming pineapple, you need to pay attention to those who are allergic to pineapple, stomach ulcers, mouth ulcers are prohibited from eating, so as to avoid skin itching and other allergic symptoms, if you are not feeling well, you should inform your doctor in time.