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Seed oils are not harmful simply because they come from seeds. Most are rich in unsaturated fats, and replacing some saturated fat with them can lower LDL cholesterol; repeatedly heating frying oil or eating a diet dominated by ultra-processed foods is a separate issue.
A ripe pear should be tender, but the flesh around its core should not become a watery or brown mass. If that area collapses, leaks, smells fermented, or has mold, the pear has moved beyond useful ripeness and should be discarded.
An apple can develop brown flesh inside without any bruise showing on the skin. Internal browning can result from maturity and storage conditions; if the brown tissue is wet, mushy, moldy, or fermented-smelling, it should no longer be treated as a simple quality defect.
An apple can develop mold in the seed cavity while its skin still looks firm and healthy. If cutting the fruit reveals fuzzy or powdery fungal growth in the core, discard the whole apple rather than simply scooping out the seeds and eating around it.
A pear can begin browning around the core after it has ripened too far or exceeded its useful storage life. A small firm-to-soft brown area may reflect overripeness, but watery, collapsing, moldy, or fermented-smelling tissue is a reason to discard the fruit.
The gritty sensation in pear flesh comes mainly from clusters of thick-walled cells called stone cells or sclereids. They are a normal part of the fruit, not seeds or crystals, and their presence by itself does not mean the pear is spoiled.
A small black spot that is dry and superficial can sometimes be trimmed away if the radish is firm and the flesh directly underneath is clean. If the lesion is sunken, wet, soft, spreading inward, moldy, or foul-smelling, discard the radish.
A mealy apple can still be sound. As apples age and their cell structure changes, the cells separate more easily instead of bursting and releasing juice, creating a dry, grainy bite. If there is no mold, rot, or off odor, the problem is mainly quality.
Firm, glassy, water-soaked-looking flesh around an apple core can be watercore, a maturity-related physiological disorder. It is not rot by itself, although severe watercore shortens storage life and can progress to internal browning and breakdown.
An artichoke that turns brown or nearly black shortly after cutting is usually undergoing enzymatic browning where the flesh meets air. If it was firm and sound before cutting, the quick surface color change does not mean it suddenly spoiled.
Wide-open leaves or dry tips usually mean an artichoke is overmature or has lost moisture, not that it is automatically rotten. If it is still firm, dry, and normal-smelling, it can be cooked, although the bracts and heart may be tougher and more fibrous.
A wrinkled or slightly flexible beet is often dehydrated rather than rotten. Cut it open: if the flesh is still firm, clean, and normal-smelling, it can be cooked; wet, mushy, slimy, moldy, or foul-smelling tissue means discard it.