When you have just finished a sumptuous meal at a restaurant and are feeling a bit uncomfortable, even your pants seem to have become tighter, making it impossible to take another bite. At this moment, a tray of desserts passes by you, and your hunger magically returns. It seems like we have another stomach, specifically designed to hold sweet treats after meals. There are many reasons behind this. Ryan Epstein, a professor of pediatrics at the State University of New York and head of the Department of Behavioral Medicine at the Jacobs School of Medicine and Biomedical Sciences at the University at Buffalo, said in an interview, "Sometimes, people stop eating not because they are full, but because they are tired of these foods and feel like they have eaten enough. After knowing the specific taste of these foods in front of them, it is difficult for them to produce more taste stimuli. However, if you add new flavors, smells, or even textures to food, it is easy for people to overcome the feeling of 'oh, I am full'." This phenomenon is called "sensory specific satiety", which refers to a person's repeated consumption of a certain food and their perception of it. My interest will decrease, and then I will feel a sense of fullness, At this point, new types of food may become more attractive. For example, in an experiment conducted by Epstein in 2011, 32 women were divided into two groups. One group ate macaroni and cheese every day for five consecutive days within a week, while the other group only ate macaroni and cheese once a week for five weeks. Researchers have found that women who eat macaroni and cheese every day eat less than those who eat macaroni and cheese once a week. In another study published by Epstein in 2013, he divided 31 children into three groups: the first group ate the same macaroni and cheese for five consecutive days, the second group could choose different brands of macaroni and cheese, and the last group could choose different types of high calorie foods, such as fried chicken nuggets and cheeseburgers. The results showed that children with multiple options ate more than those who were only provided with cheese and macaroni. Epstein believes that this result is similar to people being able to eat desserts after savoring salty food, or experiencing a sudden increase in appetite at a buffet with a variety of dishes. You can constantly provide new foods and keep people eating until they can no longer eat, "Epstein said." This is one of the reasons why people always eat until they can't hold on. "Some experts believe that this desire for food diversity reflects an evolutionary adaptation, as people need to obtain essential nutrients such as vitamins and protein from different foods. In the long run, we need a good combination of nutrients, "said Barbara Rolls, director of the Human Feeding Behavior Research Laboratory at Pennsylvania State University in the United States." But now it seems counterproductive. We can eat a variety of high calorie foods, and the diversity of food stimulates overconsumption, which may lead to more people developing obesity problems. "When a person eats a dessert, the brain secretes a chemical called dopamine. It is related to the feeling of reward and pleasure. If eating desserts is a part of your daily life, "the dopamine initially released after you finish eating will become released as soon as you have the thought of eating," Epstein said. This is the reason for some binge eating behaviors, which can make you more likely to reach for a piece of pie after a big meal. According to Rawls, if you want to reduce your intake of junk food after meals, there are several ways to utilize "sensory specific satiety". For example, you can choose other sweet foods, such as fruits, so that your diet still maintains diversity, but your eating habits are healthier. Rawls said, "What you need to do is always have a variety of healthy, low calorie, and nutritious foods that you like ready, so that when you want to eat some snacks, you can have more healthy varieties to choose from