1, spicy. Nuts contain a lot of unsaturated fatty acids, which will lead to rancidity and produce what we often call "spicy taste" if stored improperly or for a long time. Fatty acids in nuts are rancid, which is harmful in that, on the one hand, it makes the taste of nuts worse and produces pungent taste. On the other hand, rancidity products of oil in nuts, such as small molecular aldehydes and ketones, also threaten health. Eating too much will cause diarrhea, and if it is serious, it may also cause liver disease. Nut vendors are generally reluctant to throw away spoiled nuts, and the best way to cover up the "spicy taste" is to add a lot of salt, pepper, aniseed, saccharin, essence and so on. Used for seasoning during processing, so spoiled nuts are often hidden in salty, spiced and creamy nuts. In contrast, the quality of vegetarian fried nuts is relatively better.
2, moldy. Many nuts are easily contaminated by Aspergillus flavus, which can produce a highly toxic substance-aflatoxin, which can make people have a fever, vomit and even endanger their lives. Aflatoxin also has a strong carcinogenicity and does great harm to human organs. So moldy nuts must not be eaten. Once the nuts in your mouth are found to be bitter, musty or spicy, spit them out and rinse your mouth in time.
3, fried. Nuts contain a lot of fat, protein and carbohydrates, and ordinary heating is not enough to destroy them. However, when the nuts are burnt, the temperature is above 200℃. At this time, these nutrients that were originally beneficial to the body began to be partially transformed into carcinogens such as benzopyrene, heterocyclic amines and acrylamide. So roasted nuts are not suitable for eating.