Health must know: Can street roasted sweet potato eat at ease?

Ms. Cai, a Beijing reader, asked: The roasted sweet potatoes on the street can always whet my appetite. I heard that roasted sweet potatoes contain a lot of carcinogens, and some people say that the barrels of roasted sweet potatoes are chemical barrels such as petrol barrels and diesel barrels. Is it true that the sweet potatoes used for baking are black spot pathogens?

Vice President and Secretary General Wang Xufeng of the Capital Health Nutrition and Food Society replied: These rumors about roast sweet potatoes are overstated. First of all, baking to produce carcinogens, mainly starch amides, acrylamides produced by heating above 140°C, heterocyclic amines produced by protein scorching, and benzopyrenes produced at high temperatures. However, sweet potatoes have almost no fat and few proteins, and they often use charcoal fire to indirectly bake, and the temperature reached is limited. Therefore, normal baked sweet potatoes are not prone to produce a large number of carcinogens, and they are less dangerous. If the brown sweet potato surface has brown sticky things, don't worry. This is because the sugar in the sweet potato is concentrated at a high temperature, resulting in a caramelization reaction, and it is not toxic to the human body. Secondly, gasoline is volatile, even if the diesel is less volatile, it will burn completely under high temperature roasted, and most of the roasted sweet potato barrels are coated with a thick layer of mud, so use this bucket. You don't have to worry too much about baking sweet potatoes. The barrels filled with industrial raw materials such as benzene will be very irritating, and the slightly savvy roasted sweet potato traffickers will not choose such barrels because no one who is willing to bake them out has an unpleasant pungent odor. . Finally, it is not difficult for people who often eat sweet potatoes to find that, whether they are buying raw sweet potatoes or roasted sweet potatoes, “black spot pathogens” are hardly found. In addition, most of the black spot pathogens are concentrated on the epidermis of sweet potatoes, and few people eat sweet potato skins.

When consumers choose to bake sweet potatoes, try to select the complete and fully cooked skin. If you are really worried about the safety of street-baked sweet potatoes, sweet potatoes baked in an electric oven or infrared oven can be used.

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