Seafood can be eaten overnight, but it is best not to eat it. Overnight seafood not only lost nutrients in a large area, but also deteriorated in taste. It is best to eat within 1-2 hours after cooking. If you want to eat seafood overnight, you must thoroughly heat it before eating it, and don't eat it in large quantities, otherwise it may be uncomfortable. Try to choose fresh seafood when buying, cook it as soon as possible after buying, and don't leave it at room temperature for a long time. Seafood is rich in protein, and protein is very perishable, which may produce harmful substances if left for a long time. Tips for choosing seafood: 1. When buying frozen marine fish, pay attention to the eyes, belly and scales of the fish. Frozen marine fish with clear and bright eyes, complete abdomen and complete scales are relatively fresh. Due to long-term storage or air-drying, the eyes of stale frozen marine fish often become turbid and collapse, and the abdomen of the fish will also be damaged by the deterioration of the fish. 2. Pay attention to the colors of swordfish and yellow croaker when purchasing. Swordfish should be silvery white, and yellow croaker is relatively fresh. If you can see the gills of frozen marine fish, you can also identify their freshness. If fish gills are black or white or excessively bright red, they may not be fresh. The gills of fresh frozen marine fish should be natural dark red.