人的循环血量是垣定的，饭后体内的血液会集中地流向回肠道，帮助消化和吸收，如果吃得过饱，血液就会过多地集中在胃肠消化器官，使脑组织处于相对的缺血状态，此时大脑所需的营养供给不足，脑内酸性代谢产物堆积过多，使人头昏、困乏，这就是饭后常感到困倦的原因．学者们进 People’s circulating blood volume is set to Yuan, after the body’s blood will flow to the ileum, to help digestion and absorption, if you eat too full, the blood will be too much focus on gastrointestinal digestive organs, so that brain tissue in Relative ischemic conditions, when the brain needs less nutrients supply, excessive accumulation of acidic metabolites in the brain, dizziness, sleepy, which is often the cause of sleepy after meals. Scholars into