Most cooked leftovers can be safely stored in the refrigerator for 3 to 4 days at 40°F (4°C) or below. After that, the risk of bacterial growth increases significantly. Always reheat leftovers to an internal temperature of 165°F (74°C) before consuming. Label containers with dates to track freshness.

The 2-hour rule states that perishable foods should not be left at room temperature for more than 2 hours. If the ambient temperature is above 90°F (32°C) — such as at a picnic or in a hot car — the safe window shrinks to just 1 hour. After this time, harmful bacteria like Staphylococcus aureus and Salmonella can multiply to dangerous levels. This applies to meat, dairy, cut fruits, cooked vegetables, and any prepared foods.

Yes, but with caveats. Milk can be frozen for up to 3 months, though it may separate upon thawing — a good shake usually restores it. Hard cheeses freeze well for up to 6 months (texture may become crumbly). Yogurt can be frozen for 1–2 months but may become grainy. Avoid freezing cream cheese, sour cream, and soft cheeses like brie, as they become watery and unpalatable. Always thaw dairy products in the refrigerator, not at room temperature.

Use your senses — the "sniff, look, touch" test. Check for: off odors (sour, rancid, or ammonia-like smells), visible mold or unusual discoloration, slimy or sticky textures on meats and produce, and bulging or leaking packaging (especially cans). However, some harmful bacteria like Listeria don't produce obvious signs, so always adhere to storage time guidelines. When in doubt, throw it out.

"Use By" is a safety indicator — it's the last date recommended for consuming the product at peak safety. Found on highly perishable items like meat and dairy. "Best Before" (or "Best If Used By") is a quality indicator — the food is still safe to eat after this date but may lose flavor, texture, or nutritional value. "Sell By" is for retailers' inventory management and is not a safety date. Many foods are perfectly safe beyond their "best before" date if stored properly.

Unopened canned goods can last 2 to 5 years (or even longer) when stored in a cool, dry place. High-acid foods like tomatoes and fruits last about 12–18 months, while low-acid foods like meats and vegetables can last 2–5 years. Never eat from cans that are bulging, severely dented (especially along seams), rusted, or leaking — these may harbor Clostridium botulinum, which causes botulism. Once opened, transfer contents to a clean container and refrigerate, using within 3–4 days.

It depends on the food type. Highly perishable foods (raw meat, poultry, seafood, dairy) should be consumed by their "use by" date and never eaten if past it. Shelf-stable foods (crackers, pasta, rice, canned goods, spices) are often safe for months or even years past their "best before" date if stored properly, though quality may decline. Always inspect for signs of spoilage. For baby formula and medical foods, strictly adhere to expiration dates — no exceptions.

Your refrigerator should be set at or below 40°F (4°C) — ideally between 35°F and 38°F (1.7°C–3.3°C) for optimal food preservation without freezing. Your freezer should be at 0°F (-18°C) or lower. Use an appliance thermometer to verify, as built-in dials can be inaccurate. Keeping these temperatures consistent is one of the most effective ways to extend food shelf life and prevent foodborne illness.