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Why do our faces turn sour when we eat something sour?

I will do a challenge. Take a lemon Cut it with a knife and eat it. While eating, try to keep your face normal.

Can you do it? There are some exceptions, but I think almost all of them will be more or less embarrassed. Why did this tiny fruit automatically move the muscles in our face while we were still in control?

Why did the tiny fruit automatically move the muscles in our face while we were still in control?

At present, scientists do not know exactly. However, there are three main components to this process. Protons; Vitamin C and our ancestors lived on trees, probably due to tropical fruit buds.