The main problem with homemade jam is that it is difficult to preserve and easy to harbor bacteria; at the same time, it is high in calories and can easily lead to obesity if consumed in excess. Homemade jam is at home in the cooking machine will fruit fruit broken, and then made into sauce. The general factory production of jam need to add preservatives and other substances, homemade jam at home can not meet the factory’s health standards, sterilization standards, but also can not add the appropriate preservatives, which can easily lead to jam corruption, breeding bacteria, which triggered a series of gastrointestinal reactions, and may even lead to food poisoning. At the same time, the jam production process requires the addition of a large number of sugars, which leads to caloric excess, after eating too much may cause obesity. Applesauce, for example, 100 grams of applesauce calories is 278 calories, of which 69 grams of carbohydrates, fat and protein content is very small. This leads to a single nutritional structure of the jam, while after a long time of preservation, the vitamins and other nutrients in it are also consumed greatly. So it is still recommended to try to eat fresh fruit, avoid making jam, especially not recommended to make homemade jam at home.