How long foods keep and how refrigeration, containers, temperature and storage conditions affect quality and safety.
Strawberries combine delicate skin, abundant water, rapid metabolism and susceptibility to gray mold. Refrigeration slows those processes but does not stop them, which is why one damaged berry can deteriorate quickly and affect its neighbors.
For most intact fruit, washing shortly before you eat or cut it is the simplest approach. Rinse under running water, do not use soap, and dry if needed. If you wash before storage, dry the fruit thoroughly because lingering moisture can encourage faster deterioration.
Broccoli yellowing usually signals senescence: chlorophyll breaks down as the florets age, especially with prolonged storage, warm temperatures, or ethylene exposure. UC Davis considers yellow florets the end of commercial shelf life, but yellow alone is not a safety diagnosis; mold, slime, rot, and off odors are different signals.
Fresh mushrooms deteriorate quickly. Slight drying, wrinkling, or darkening can simply mean age, while a slippery slime, sour or strong off odor, visible mold, and watery breakdown are clear reasons to discard them.
Bananas respond strongly to ethylene, a gaseous plant hormone that triggers ripening. Apples, pears, avocados, and other climacteric fruits also release ethylene, so grouping ripe fruit together can increase local exposure and speed softening, yellowing, aroma development, and starch-to-sugar conversion.
Pink or reddish ribs do not automatically mean lettuce is bad. UC Davis describes pink rib as a postharvest physiological disorder associated with overmaturity, long storage, or warmer-than-recommended conditions. If leaves remain reasonably crisp with no mold, slime, or off odor, the discoloration is usually a quality issue.
A cut onion can generally be kept about 7–10 days in the refrigerator when stored at 40°F (4°C) or below in a sealed container. That range is a storage guideline, not a guarantee: mold, slime, watery breakdown, or a clearly abnormal odor are reasons to discard it sooner.
Yes. Bread that is merely dry or hard is not automatically unsafe; staling is mainly a texture change involving moisture and starch. Bread with visible mold, unusual odors, or abnormal dampness is different, and moldy bread should be discarded rather than trimmed.
Yes, but potatoes do not all freeze equally well. Mashed potatoes and many cooked potato dishes usually freeze much better than raw potatoes. Thawed potatoes may release water or become slightly grainy, but reheating and stirring can improve the texture.
Cut potatoes can be held under cold water in the refrigerator to prevent browning. For home cooking, using them within about 24 hours is a good quality target. Longer soaking removes more starch and soluble material and can gradually weaken texture.
To prepare potatoes a day ahead, cover peeled potatoes completely with cold water and refrigerate them in a covered container. Water limits oxygen exposure and slows browning. Drain them the next day, and dry thoroughly if they are going into hot oil or a dry oven.
Cut avocado browns when enzymes in the flesh react with oxygen. Refrigerate it, minimize air contact with wrap pressed directly onto the surface or a small airtight container, and add a little lemon or lime juice if you do not mind the flavor.