Food-safety guidance on handling, cooking, storage, spoilage signs and when food should be discarded.
No. Washing or rinsing raw fish before cooking is not needed for safety and can increase cross-contamination by splashing germs onto the sink, counters, utensils or ready-to-eat food. If the surface is very wet, pat it dry with disposable paper towels instead; safe handling and adequate cooking do the actual food-safety work.
A watery egg white is usually a sign of declining quality with storage. As an egg loses carbon dioxide, albumen pH rises and the protein structure that holds the thick white weakens. USDA says thinner, clearer whites are consistent with aging, but watery texture alone does not prove the egg is spoiled.
Yes. Cooked fish can be frozen if it was handled safely. USDA recommends 0 °F or below and gives up to about 3 months for best quality. Refrigerate or freeze leftovers within 2 hours of cooking or serving; freezing fish that has already spent too long warm does not make it safe again.
Opened shredded cheese should stay at 40 °F or below, and the package's after-opening direction is the most specific guide. FoodKeeper gives about 1 month as a broad refrigerated reference for shredded cheese, but some manufacturers recommend a much shorter period after opening. If mold appears in shredded cheese, discard the whole package.
There is no single storage time for every cheese. USDA gives about 3–4 weeks after opening for hard cheeses such as cheddar, Swiss and Parmesan, while soft cheeses such as cottage cheese, ricotta or Brie are generally around 1 week. A shorter package instruction should take priority.
Fresh cheese should stay refrigerated and the package's use-by and after-opening directions should come first. As a broad reference, USDA gives about 1 week in the refrigerator for several soft cheeses at 40 °F or below, but individual fresh cheeses may carry a shorter after-opening instruction.
The problem is not that rice automatically becomes dangerous the next day. Bacillus cereus spores can survive cooking; if cooked rice spends too long at room temperature, they can germinate, multiply, and produce toxin that later reheating may not destroy.
Large, long-lived predators accumulate the most methylmercury. FDA/EPA's Choices to Avoid are king mackerel, marlin, orange roughy, shark, swordfish, Gulf of Mexico tilefish, and bigeye tuna for people who are pregnant or breastfeeding and for young children.
Cooking does not create fish odor from nothing: heat helps volatile molecules enter the air. Trimethylamine is one of the characteristic compounds that increases as many marine fish lose freshness, so a strong off-odor before cooking is more concerning than aroma that becomes obvious only once the pan is hot.
FDA monitoring data place scallops at 0.003 ppm mean mercury, clams and shrimp at 0.009 ppm, and sardines at 0.013 ppm. Choosing species from FDA/EPA's Best Choices list is a practical way to keep mercury exposure low while still eating seafood.
Fresh shrimp should smell mild and feel firm. A sour, rancid, strongly fishy or ammonia-like odor is a clear warning, and pronounced sliminess or mushiness adds concern. Sensory checks cannot extend an expired refrigerated storage window.
Cooked shrimp should generally be used within 3–4 days in a refrigerator at 40°F (4°C) or below, assuming it was chilled promptly. A normal smell on day five does not extend that window because pathogens do not always cause obvious spoilage.