8.Such dates apply only to unopened foods. Once a product is opened, it usually needs to be eaten within a few days. But some consumers mistakenly believe products are good until their best before dates, even if they open them weeks before. 9.Experts recommended a solution for this problem: Provide labels that offer an indication of shelf life after opening, using phrasing such as "Best within XX days of opening". 10.Consumers shouldn't fully rely on them. That's because the dates assume that food distributors and retailers have ensured they kept the foods at the right temperatures. Even milk with a best before date of three weeks from now can still go off if it's allowed to sit (放置) outside a refrigerator for too long. 11.Schwartz doesn't agree with those who say that a little bit of mold isn't harmful. Schwartz notes that food mold can release a toxin and there's been "quite a bit of research" showing that this toxin can raise the risk for certain types of cancer, including liver cancer. 12.Such moulds can travel through soft or liquid foods, bringing the toxins with them, which is why it's important to throw mouldy food out. 13.With hard cheeses or hard produce such as an onion, it's safe to cut away the mould, she says, but that's not the case with softer foods. 14."A tomato with a little mould on it should be thrown out. A container of yogurt with mould should be tossed," she says. "If I see mould on any part of a bread, I throw the whole thing out.”
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