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Moderate food can bring happiness to people, but too much food can lead to disease. With the increasing popularity of fast-paced society and the gradual increase of fast food species, more and more young people in cities are suffering from obesity but are not aware of it. This high level of methane and hydrogen in the exhaled gas, and the combination of it with the cellphone dust plug. Use cute, ingenious ways to remind people who are at risk of potential obesity.