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Manufacturers universally tell you to refrigerate mayonnaise once opened, though, because it helps preserve the flavor. Warmth causes mayonnaise to break down after a while, and it gets to the point where it just tastes oily. Homemade mayonnaise, of course, is a different matter. With its use of raw eggs, it is highly perishable and should be consumed immediately or refrigerated and finished off very shortly.
Should Tuna Be Refrigerated? You should most definitely make sure to refrigerate the tuna that you get home from the supermarket, whether it is canned or fresh, in order to avoid it going bad. Since tuna doesnÃ¢â¬â¢t stay fresh for a very long time, you will need to keep it in a sealed container in the refrigerator until you are ready to eat it.