不少孩子为了上学、赶场电影或贪玩。吃饭很快。有的顷刻间就可以扔下碗筷,飞快地跑了。这种“狼吞虎咽”对孩子身体发育是很不利的。怎样吃饭好呢?这里面有科学道理。食物进入人体需要消化。消化包括机械和化学消化两部分,前者主要在口腔内,如前牙和小磨牙主要是切断、撕裂和捣碎食物;大磨牙可以把食物嚼碎磨细。咀嚼的同时,唾液腺不断地分泌唾液(口水)与食物混合,在舌的搅拌下形成食团,咽下后进入胃里,开始了胃液的化学性消化。这样才能使食物得到充分的消化和吸收。从这里可以看出口腔内机械性消化不可忽视。医学工作者曾做过一个实验,两个人同吃一种食品,一个人狼吞虎咽,另一个人细嚼慢咽,结果后者比前者能多吸收蛋白质百分之十三、脂肪百分之十二、纤维素百分之四十三。细嚼食物时,能通过条件反射、 Many children go to school, go to the movies or play fun. Eat fast. Some of the moment you can throw away chopsticks, ran quickly. This “devouring ” is very detrimental to the child’s physical development. How to eat well? There are scientific principles. Food into the body needs to digest. Digestion, including mechanical and chemical digestion in two parts, the former mainly in the mouth, such as anterior teeth and molars mainly cut off, torn and mashed food; molars can crush food grinding. At the same time of chewing, the salivary glands continuously secrete saliva (saliva) mixed with the food, form a bolus under agitation of the tongue, enter the stomach after swallowing, and start the chemical digestion of the gastric juice. Only in this way can food be fully digested and absorbed. From here you can see the mechanical digestion can not be ignored in the mouth. Medical workers have done an experiment, two people eat a food, one devoured, the other chewing slowly, the latter can absorb more than the former protein 13 percent, 12 percent fat , Forty-three percent of cellulose. Chewing food, through the conditioned reflex,