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