Why does pineapple taste astringent?

Pineapple, also called pineapple, is a famous tropical fruit. Its hometown was originally in Brazil in America, and later it gradually expanded to south-central America. China has been introduced and cultivated since17th century. Pineapple pulp is golden yellow, rich in water and nutrients, such as sugar, vitamin C, malic acid, citric acid, etc., and its taste is particularly sweet. Pineapple pulp also contains a kind of "pineapple enzyme (méi)", which has a special stimulating effect on our tongue and oral epidermis, but salt can control the activity of pineapple enzyme. Therefore, if we eat pineapple pulp that has not been soaked in salt water, our mouth, tongue and lips will feel slightly numb and tingling, which is the role of enzymes. Let's soak the fresh pineapple pulp in salt water first. After eating it, we won't have such numbness and tingling. Of course, we think pineapple is especially sweet.

Although pineapple enzyme is uncomfortable to eat in the mouth, it is actually a good thing. It can decompose protein, so eating pineapple will increase your appetite and make your appetite better. However, too much pineapple enzyme can also cause gastrointestinal discomfort.