Under normal circumstances, people can meet the physiological demand for nutrients through three meals a day, and there is no need to eat snacks. But in some special cases, eating some snacks will be good for your health. Here are some examples to illustrate: the elderly. Eating some snacks properly is good for your health. Why? Because the digestive system function of the elderly decreases, such as the decrease of gastric juice secretion and digestive enzyme secretion, the digestive absorption function decreases to some extent. In this case, if you still eat three meals a day, you will not be able to meet the nutritional needs of the elderly. Due to the decline of digestive function, it is difficult to digest and absorb every meal for a period of time, which brings more burden to the gastrointestinal tract and often causes indigestion symptoms. If you eat 70% to 80% full every meal and feel hungry between meals, eating a little digestible and nutritious snacks can not only ensure the normal nutritional needs of the elderly, but also not cause excessive burden to the gastrointestinal tract.

The nutrients needed by the human body are mainly obtained through three meals a day, and snacks can only be used as a supplement. So snacks can't be eaten without restraint. They are eaten while walking, doing homework, watching TV and chatting. Eating snacks in this way not only affects dinner, but even replaces dinner with snacks.

As we know, the work of human digestive system is regular. When you eat a certain amount of food, your stomach will feel full. At this time, we will no longer have the desire for food. After a period of time (usually 2~4 hours), the food in the stomach is basically emptied, the gastrointestinal tract will accelerate peristalsis, and the secretion of gastric juice, intestinal juice and bile will accelerate, sending a signal to the brain that I am hungry. People will feel hungry at this time, and we need to eat. But for those children who don't leave their snacks, food keeps entering their stomachs and can't be emptied. In this way, when they have dinner, they will lose their appetite and eat little or nothing. Because they eat too little for dinner, they will be hungry again soon, so they will eat snacks again. Over time, the normal working rhythm of human digestive system is destroyed and the digestive function is disordered, which will inevitably affect their health.