smell is an important means to judge whether the food has deteriorated. When the following kinds of taste appear, it means that the food has deteriorated and can not be eaten again.

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have a Hala flavor. Food with more fat, such as oil, cakes, dried salted fish products, walnuts, peanuts, melon seeds, etc., will produce a bitter, numb, pungent and unpleasant smell, which is commonly known as “Hala flavor”. This is because the oil is easy to be oxidized, rancidity, resulting in the production of the Hala flavor.

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stink. Fish, pork, eggs, tofu, dried bean curd and other protein rich foods are putrefaction and putrid. Under the action of microorganisms and enzymes, protein can be decomposed into organic amines, sulfides, faecal odors, aldehydes and other substances, with a foul smell.

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are sour. Food rich in carbohydrates, such as grains, sugars and their products, will produce sour or sour taste with their own characteristics when they go bad. Carbohydrates can be decomposed into monosaccharides, disaccharides, organic acids, alcohols and aldehydes, so they can produce sour or wine taste. The phenomenon of rotten rice, sour cakes and rotten fruits is one of these deterioration phenomena.

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are moldy. Food contaminated by mold, such as grain, peanut, bread, cake, rice, steamed bread and so on, is often moldy and deteriorated in warm and humid environment. Molds can produce toxins, such as aflatoxin, which we are familiar with.

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food with the above smell is not only bad smell and bad taste, but may cause nausea, vomiting, diarrhea and other digestive system symptoms, and long-term consumption may also induce cancer. ▲

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