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Miracle fruit is a red berry also known as Synsepalum dulcificum. The fantastic quality about this berry is that after eating it, acidic foods which should be sour, taste sweet.

The secret behind this is a protein called Miraculin found in these fruits. However, experts aren't sure how miraculin actually works. But there are three popular theories.

First theory states that miraculin temporarily suppresses sour taste receptors. Hence, when we eat acidic foods, they don't taste sour.

Second theory states that miraculin rewires the sweet receptors such that they begin to identify acids as sugars, thus making sour foods taste sweet.

Whereas third theory states that acids cause miraculin to change its shape, causing it to bind to the sweet receptors more strongly and thus, making them over activated, producing a sweet taste.