Why does eating too much pineapple make your mouth astringent?

Let's talk about three bad things in pineapple, which may bring trouble to people.

(1) glycoside:

It is an organic substance, which can stimulate human skin and oral mucosa. Therefore, after eating untreated raw pineapple, the mouth will feel itchy and numb, but it is not directly harmful to health.

(2) serotonin:

It is a nitrogen-containing organic substance, which can make blood vessels contract strongly and raise blood pressure. Every 100g fruit juice contains 2.5-3.5 mg. The first reaction after eating too much is a headache.

(3) bromelain:

It is a protein hydrolase (foreign protein). After extraction, it has a strong function of decomposing fibrin and blood clots, so it is very useful in medical treatment. A small amount of bromelain in pineapple is decomposed and destroyed by gastric juice after being eaten in the stomach. But a few people are allergic to this enzyme. Severe abdominal pain, nausea, vomiting, diarrhea, limb flushing, urticaria, headache, dizziness, tongue numbness and other symptoms occurred from 15 minutes to 1 hour after eating. In severe cases, dyspnea, confusion and shock will occur, which is life-threatening.