How long foods keep and how refrigeration, containers, temperature and storage conditions affect quality and safety.
Raw egg whites can be frozen as they are and retain their functionality well. Yolks also freeze, but they tend to thicken and gel: for about four yolks, mix in 1/8 teaspoon salt for savory use or 1½ teaspoons sugar for desserts. Never freeze whole eggs in their shells.
Yes, cheese can be frozen, but quality depends heavily on the style. Hard and semi-hard cheeses generally tolerate freezing better, while soft and high-moisture cheeses may separate or turn grainy. Freeze tightly wrapped portions and thaw in the refrigerator with the final use in mind.
Opened cheese should go back into the refrigerator protected from drying and contamination. Hard cheese keeps best when wrapped without trapping heavy condensation; soft and fresh cheese should stay covered and be used sooner. The cheese type matters as much as the date you opened it.
Yes, cooked shrimp can be frozen. Freeze them while they are still safely handled, package them with little air, keep the freezer at 0°F (-18°C) or below, and thaw in the refrigerator when possible. Freezing cannot correct seafood that already spent too long warm.
Yes, you can eat pasta the next day if it was refrigerated soon after cooking and kept cold. The risk is driven more by time spent warm than by the fact that 24 hours have passed. For properly chilled leftovers, USDA uses a 3-to-4-day refrigerator window.
Yes. Freeze fresh salmon promptly, remove as much air as possible and keep the freezer at 0°F/-18°C or colder. USDA quality guidance for raw frozen fish is roughly 3-8 months. If the salmon will be eaten raw, use the specific parasite-destruction rules that apply to that preparation rather than assuming ordinary storage time is enough.
Cheese can “sweat” for several reasons. Temperature changes move water through the cheese and can create condensation; warming makes milk fat more fluid; and fresh high-moisture cheeses can release whey. A few clean droplets are a different finding from slime, off odors or unexpected mold.
A whole bone-in cured ham does not suddenly expire on one fixed day after the first slice. For best eating quality, plan to finish it in roughly 3-6 weeks; specialist ham retailers sometimes give 6-8 weeks under good conditions. Heat, light and an uncovered cut surface shorten that window.
Fresh and canned sardines are nutritionally strong choices. Canning changes texture and may add salt or oil, but it preserves protein and omega-3 fats. When the soft bones are eaten, canned sardines can also provide much more calcium than boneless fresh fish.
Coffee aroma fades fastest with exposure to air, moisture, heat and light. The National Coffee Association recommends buying smaller amounts, storing coffee in an airtight opaque container in a cool dark place, and grinding whole beans only when needed. As a freshness guide after opening, it lists about 1–3 weeks for roasted beans at room temperature and 1–2 weeks for ground coffee when properly stored.
Whole-bean coffee usually holds aroma longer because most of the bean remains protected from air. Grinding dramatically increases surface area and speeds volatile loss, which is why the National Coffee Association recommends grinding only what you need immediately before brewing when practical. Pre-ground coffee wins on convenience, not on a different nutrition profile.
Plain chocolate usually carries a best-quality date rather than a sudden safety deadline. If it was stored properly and the package is intact, passing that date may mean weaker flavor, texture changes, or bloom rather than automatic spoilage. Keep chocolate tightly wrapped in a cool, dry, dark, stable place; filled products need their own label instructions.