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Flies are attracted to your food because they are drawn to the smell of organic matter, especially sugary, salty, or decaying substances. They use their sensitive antennae and feet to detect odors and taste surfaces. Once a fly lands on your food, it may be feeding or looking for a place to lay eggs. Their habit of regurgitating digestive enzymes to liquefy food also increases the risk of spreading bacteria, which is why it's best to keep food covered and surfaces clean.