ADHD, the most common psychiatric disorder in children, is affected by many factors, but a new Dutch study suggests that there is also an interesting link between sunlight intensity and ADHD. Those who live in sunny areas, children are less likely to develop ADHD. According to the Daily Mail, a new Dutch study shows that children living in sunny areas are less likely to suffer from ADHD. The findings were published in the journal Biological Psychiatry. The Centers for Disease Control and Prevention and the U.S. Department of Energy created a simple data graph showing the prevalence of ADHD in different states within the United States and at different sun intensities (sunshine). By analyzing the data graph, the researchers found that there was a correlation between ADHD prevalence and sunlight intensity levels. High sunlight intensities in the U.S. and other regions showed lower ADHD rates, suggesting that high sunlight intensities have some “protective” effect on ADHD. To further test this conclusion, they also analyzed whether there was a relationship between autism and major depression and sunlight intensity. They found that this relationship did not exist in either disorder, but only in ADHD. Perhaps our biological clocks help explain this relationship, according to Dr. Martijn Arns, the study’s main leader. In fact, treatment of sleep disorders and restoration of the biological clock to a normal resting time, including treatment with outdoor light exposure, has been shown to improve symptoms of ADHD. Therefore, he proposed that in areas where there is not enough sunlight, people can use open skylights for classrooms or give children more playtime to maximize their exposure to sunlight. In addition, we usually use a lot of computers, smart phones, etc., which seriously ruin our rest time, manufacturers should develop color-adjusted country over the screen to filter out the destructive blue light. All these measures can do something to prevent ADHD. ADHD is the most common psychiatric disorder in children. ADHD affects about 5 to 7 percent of the population worldwide, but also fluctuates widely depending on geography. ADHD is characterized by an inability to focus the brain, poor attention span, hyperactivity and impulsive behavior. Children with ADHD have delayed brain development, and patients also report problems such as sleep difficulties and disorders. Scientists do not know what causes it, but it is clear that genes play a key role in the disorder. Other risk factors have been identified one after another: including prematurity, low birth weight, maternal alcohol or tobacco use during pregnancy, and exposure to toxic substances such as lead. Even though ADHD is known to be associated with other factors, studies continue to find that the disorder is related to the intensity and amount of sunlight children receive. John Krystal, editor-in-chief of Biological Psychiatry, said the findings of this association are very intriguing, but also raise additional questions to be answered, such as: If sunny weather can reduce the symptoms of ADHD or lower the incidence, what is the rationale? Are people more likely to develop ADHD if they change their area of residence and have less sunlight exposure? What are the reasons for this? All of this requires further research by researchers. The causes of ADHD are complex and may be related to the following factors: a. Genetic factors Several studies have shown that ADHD is a familial disorder with complex genetic characteristics, with an average heritability of 0.76, suggesting that genetic factors play a major role in the etiology of ADHD. Organic factors Mild brain damage during maternal pregnancy, perinatal period and after birth due to various causes may be the cause of the disorder in some children, but no one brain damage exists in all children with the disorder, and not all children with this damage have the disorder, and many children do not have evidence of brain damage. Neuroanatomical factors Magnetic resonance studies have reported reduced volume of the corpus callosum and caudate nucleus in children with this disorder, and functional MRI studies have also reported reduced metabolism in the caudate nucleus, frontal region, and anterior cingulate gyrus in children with this disorder. Neurophysiological factors The children with this disorder have a high rate of EEG abnormalities, mainly increased slow-wave activity. EEG power spectrum analysis found that slow wave power increased, alpha wave power decreased, and mean frequency decreased. This suggests that the child with this disorder has delayed maturation of the central nervous system or insufficient arousal of the cerebral cortex. V. Neurobiochemical factors Some studies suggest that the disorder may be related to the metabolic disorder and abnormal function of central neurotransmitters, including: dopamine and adrenaline update rate is reduced, dopamine and norepinephrine function is low, etc. Sixth, psychosocial factors Early overdevelopment of intelligence, excessive learning burden, poor social environment, family environment, such as excessive economic poverty, parental relationship breakdown, inappropriate education methods can increase the risk of ADHD in children. VII. Other factors The disorder may be related to zinc and iron deficiency and increased blood lead. Food additives may increase the risk of ADHD in children.