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Why does unripe fruit taste sour, but ripe fruit usually tastes sweet? Where the sourness
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went? Unripe fruits often taste sour due to the high concentration of organic acids present in
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them. One of the primary acids is called malic acid, which contributes to the sour taste. As
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the fruit ripens, the amount of acid decreases and the amount of sugar increases. The fruit's
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enzymes convert these acids into sugars or other compounds, which makes the fruit sweeter. Also,
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the ripening process involves complex changes in the fruit's metabolism, causing a shift in
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the balance of these chemicals, leading to an overall change in taste from sour to sweet.
