When a Pineapple is harvested, it doesn’t get sweeter, only the colour changes.
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That means that every single pineapple in the grocery store, local fruit shop or bought from the street is as sweet as it will ever be. So when you buy a pineapple you should eat it as quickly as you can.
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There are various reasons for colour difference, but it is mainly based on where the pineapple is grown as well as weather conditions. So a green pineapple can be just as sweet and yummy as a golden yellow pineapple.