Children are often excessive sweets low IQ. This is because the brain development of children to adequate food is inseparable from the protein and vitamins, while the sweets will damage appetite, reduce appetite, reduce intake of high protein and multi-vitamins, leading to functional malnutrition, which affects brain development.
Lack of sleep
Brain, the primary way to eliminate fatigue, sleep. The long-term lack of sleep or poor quality will only accelerate the decline of brain cells, smart people will become very confused.
Long-term smokers
German medical scientist studies have shown that years of smoking so that brain tissue showed varying degrees of atrophy, susceptibility to Alzheimer's. Because the long-term smoking can cause cerebral artery
Shaoyanguayu
The brain has the leaf area solely on the language, often speaking will also promote brain development and function of the brain exercises can play. Normally should have more say something rich in content, there is a strong philosophical or logical words. Day quiet, stern people who are not necessarily smart.
Hooded sleeping
People in hooded sleeping, with the quilt of carbon dioxide concentration, oxygen concentration falling foul of the long-term inhalation of humid air, the brain is lethal.
Unwilling brain
Thinking is the best way to exercise the brain. Only by their brains, diligent in thinking that people can be much wiser. On the contrary, unwilling to use their brains can only accelerate the deterioration of the brain, smart people will become stupid.
Ill with the brain
Physical discomfort or illness, reluctantly adhere to study or work not only inefficient, but also likely to cause brain damage.
甜食过量
甜食过量的儿童往往智商较低。这是因为儿童脑部的发育离不开食物中充足的蛋白质和维生素，而甜食会损害胃口，降低食欲，减少对高蛋白和多种维生素的摄入，导致机能营养不良，从而影响大脑发育。
睡眠不足
大脑消除疲劳的主要方式是睡眠。长期睡眠不足或质量太差只会加速脑细胞的衰退，聪明人也会变得糊涂起来。
长期吸烟
德国医学家的研究表明，长年吸烟使脑组织呈现不同程度萎缩，易患老年痴呆。因为长期吸烟可引起脑动脉
少言寡语
大脑中有专司语言的叶区，经常说话也会促进大脑的发育，并能起到锻炼大脑的功能。平常应该多说一些内容丰富、有较强哲理性或逻辑性的话。整日沉默寡言、不苟言笑的人不一定聪明。
蒙头睡觉
人在蒙头睡觉时，随着被子里二氧化碳浓度升高，氧气浓度不断下降，长期吸进潮湿污浊的空气，对大脑危害极大。
不愿动脑
思考是锻炼大脑的最佳方法。只有多动脑筋，勤于思考，人才能变得更聪明。反之，不愿意动脑筋只能加速大脑的退化，聪明人也会变得愚笨。
带病用脑
在身体不适或患病时，勉强坚持学习或工作不仅效率低下，而且还容易造成大脑损害。