Which behaviors will be unfriendly to our brain? The following behaviors we should avoid: 1, long-term satiety Research has found that long-term satiety, will lead to cerebral arteriosclerosis, brain premature aging and mental retardation phenomenon. 2, alcohol, sweets Alcohol weakens the inhibition of the cerebral cortex, so people feel light-headed after drinking, unsteady steps, slow reaction, etc. Alcoholism is particularly serious damage to the brain. Sweets will damage the appetite, reduce appetite, reduce the intake of high protein and multivitamins, leading to malnutrition, affecting brain development. 3, sleep with the head covered with a quilt, the carbon dioxide concentration inside will rise, the oxygen concentration continues to decline. Prolonged inhalation of humid air with high carbon dioxide concentration is extremely harmful to the brain. 4, sleep deprivation Sleep is good or bad, not all lies in the length of time, more important is the depth of sleep, deep sleep, easy to eliminate fatigue, long-term sleep deprivation or sleep quality is too poor, will accelerate the decline of brain cells, smart people will also become confused. 5, long-term smoking year-round smoking will destroy brain cells synthesize proteins will make the brain tissue show varying degrees of atrophy, nerve cell degeneration, resulting in memory loss. 6, with a sick brain in ill health when suffering from disease, barely adhere to study or work, easy to cause brain damage.