The digestion difficulty of starch foods (such as rice and potatoes) is related to the gelatinization degree and aging degree of starch, which has a great influence on food temperature. Without enough temperature, starch cannot be completely gelatinized, that is, it is unfamiliar. Once the cold rice-cooked rice is cooled, the starch molecules will gather again, the viscosity will decrease and the hardness will increase, which is called aging regeneration. After starch regeneration, it will produce more resistant starch, that is, starch molecules that are not easily digested and absorbed, which are a bit like dietary fiber. Only when they enter the large intestine can they be fermented by large intestine microorganisms.

For people with too good digestion, obesity and three highs, eating some cold food and raw vegetables with slow digestion is helpful to delay the increase of blood sugar and blood lipid after meals, improve intestinal flora and be beneficial to health. For people with poor digestive ability and thin body, the secretion of digestive juice is insufficient, and then it is even worse to cool the stomach with cold food. When the body is overtired, eat less cold food and drink less cold drinks. Because at this time, the human body is in a state of stress, and the cold tolerance of the body declines. If you eat too many cold drinks, it will cause discomfort such as virtual shedding and diarrhea, and even cause more diseases.

Warm food is beneficial to promote blood circulation in the stomach, while food with a temperature significantly lower than the body temperature, especially frozen food, will temporarily contract the blood vessels in the stomach, inhibit local blood circulation, and slow down the secretion of digestive juice and the speed of gastrointestinal peristalsis. If the gastrointestinal tract has a strong digestive function, as long as there are no ice teeth, you don't need to care too much about whether the food is warm; Even if you have indigestion, it is not recommended to eat hot food, hot food, or blow until the mouth is not hot at 41 degrees

Due to the aging of the elderly, the digestive tract function declines, and the tolerance to cold food will be significantly reduced. A large number of raw and cold foods enter the stomach, which will not only lead to digestive dysfunction of the elderly, but also induce more serious diseases, especially the elderly with weak constitution. It is best not to eat cold food. Friends with elderly people at home can find health risks in the details of life in time to prevent them before they happen. Girls should not eat ice, especially during menstruation. Cold food can lead to poor circulation, easy to produce blood clots and dysmenorrhea.