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Do you have to keep ketchup in the fridge? If you're one of those people who keeps ketchup in the cupboard, quickly move it to the fridge! According to Heinz manufacturer and food safety expert Jabraan Ahmed, this is the only real way to preserve ketchup's freshness and flavor. Ketchup stored outside the refrigerator is a real bait for wine flies, which can leave bacteria on the lid. In addition, the low temperature of the refrigerator helps prevent the growth of bacteria. The same goes for any other egg-based sauces, such as mayonnaise and salad dressing.