There are many factors affecting obesity, including heredity, diet structure, exercise and so on. Puffed foods are mainly cereals, potatoes, beans and so on. It contains less water and most of it is fried food. After pressing, heating and other processes, the volume of food itself has expanded several times. Because it is a convenient fast food, the content of sugar, salt and monosodium glutamate in food is more than that in other foods, but the content of other beneficial nutrients is very small. If you take it for a long time, it will not only increase. So eating puffed food for a month won't lead to weight gain. Reasonable adjustment of diet organization and scientific fitness exercise can help you.