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Should ketchup go in the refrigerator? It's a debate that has raged since the dawn of time - and now the world's most famous ketchup maker has weighed in. This week, the official Heinz UK Twitter account posted "FYI: Ketchup. goes. in. the. Fridge!!!" They also posted a poll, with nearly two-thirds of respondents saying they refrigerate their ketchup. Heinz has previously said that its ketchup is "shelf-stable" due to its acidity - but recommends refrigerating it to "maintain product quality".