Why do people like to eat junk food?
In the face of delicious temptations, dieters often ponder over the question: Why do desserts and junk foods with high fat content always whet the appetite? Can not those healthy foods, such as lettuce, cabbage, or apples? Some people say that this is a personal hobby. According to British and American idioms, people who like sweets have “sweet teeth†and those who like salty foods have “salty teethâ€. Many people believe that the desire for a certain food is actually a signal from the body. For example, if you really want to eat fried chicken, it's because your body needs fried chicken. But is the truth so? The evolution of appetite There are many reasons for the appetite. Scientists believe this is related to evolutionary, psychological factors (stress, sadness, etc.) and true demand for food. “People must understand that the desire for food is not caused by hunger alone,†said Andrew Hill, a professor of psychology and behavioral science at Leeds University. The opinion of nutritionists is that hunger is an expression of the body's ability to ensure energy supplements. When the stomach is empty, it releases ghrelin, a hormone that communicates with the brain's command center, the hypothalamus. So people feel hungry and know when to eat. Satiety is also a signal to the body. It is produced by the leptin released by fat cells and the insulin released by the pancreas, which tells the body that blood sugar has risen. The difference is that the generation of appetite is more complicated. In theory, in order to survive, hungry people eat whatever food they like, even if they don't like it. Appetite is a strong sensory desire for certain foods. In the brain, a series of chemicals are related to appetite. The first is dopamine. When a person experiences a novelty experience, the brain secretes dopamine. Dopamine works with another substance, the opioid peptide in the brain, to give people a sense of pleasure. If certain behaviors allow the brain to secrete dopamine and opioid peptides, the brain will keep the body repeating these behaviors. From an evolutionary point of view, human desire for junk food can be traced back to prehistoric times. High-calorie foods can provide more energy and make insurers more likely to survive. As a result, the brain will take in high-calorie foods. Behave happily and direct people to find foods that are high in fat and sugar. Into modern times, although the source of food is adequately protected, the human brain still repeats the same chemical reaction. Therefore, junk food always gives people a strong appetite. Emotional role Emotions are another factor that contributes to people’s desire for junk food. For example, when you feel stress, the body releases cortisol. The basic function of cortisol is to increase blood glucose levels, provide energy to cells, suppress the immune system, and promote the metabolism of fats, proteins, and carbohydrates. Cortisol also inhibits leptin and insulin secretion, thereby increasing hunger. In addition to stress, other negative emotions can also lead to craving for junk food. In childhood, parents often used candy as a tool for rewarding and showing love. When children grow up, the subconscious still treats high-sugar and high-fat foods as rewards. The enjoyment of taste really does make the brain feel good. For example, sweet foods allow the brain to secrete opioid peptides that reduce pain. What kind of appetite can not be ignored Sometimes, the desire for a certain food is indeed a signal that the body lacks a certain kind of nutrition. Professor Lee Gibson, a psychology professor at Roehampton University, has recruited a group of volunteers. The latter consumed a low-protein breakfast and a high-protein lunch on the first day and a low-protein breakfast and a low-protein lunch on the second day. Each meal changed its taste. On the third day, volunteers chose to avoid the taste and chose high-protein foods. Animals choose the nutrients they need, such as vitamins and minerals, and so do humans. Appetite contains signals Chocolates and desserts The appetite for these foods is usually psychological. They allow you to get a good mood in a short period of time. Pizza, pasta or biscuits It's all made of wheat. If there is a strong desire for them, it may be caused by the intolerance to wheat ingredients. Because the body does not absorb enough of this ingredient, it is eager to eat more pasta. This is very interesting, like diabetes, the patient's body can not regulate blood sugar, resulting in lack of energy, so eager to eat sugar. Fish meat If you particularly want to eat fish, such as salmon, it may be the lack of Omega-3 fatty acids. If it is tuna, there may be a lack of salt. This situation is common in dieters who consume large amounts of low protein foods such as fruits and melons. Dairy products Dairy products contain important nutrients that the body needs. If you really want to eat cheese, you may lack vitamins A and D, especially if you don't have enough fat. Red meat There may be a lack of protein, or iron intake, a common pregnancy for women. 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