The Chinese often talk about “sadness of autumn”, meaning that in autumn, emotions are easily depressed. In fact, the beginning of winter can have a similar effect on people’s psychology. Former British Prime Minister Winston Churchill suffered from winter depression. He called his depression “black dog”, and every winter, this “black dog” will be more crazy, so Churchill pain. In fact, not only Churchill, today there are many people in the winter will be depressed, depressed mood. The National Mental Health Association points out that every winter, the number of depressed patients increased significantly, even about 10% more than usual. The impact of the seasons on people’s mental health has attracted a lot of attention from industry experts. Some experts call the mental problems caused by the change of seasons “seasonal mental disorder”. According to the National Mental Health Association, the most typical signs of winter depression include changes in sleep and eating habits, persistent depressed mood and loss of interest in activities. Research by the American Academy of Family Physicians also found that people with winter depression favor foods high in sugar and starch, gain significant weight, are easily fatigued, irritable, and have difficulty concentrating. Generally, these symptoms first emerge from the turn of fall and winter, are most pronounced in January and February of the following year, and do not subside until after spring. Researchers have now identified the root cause of winter depression. After winter, the majority of countries in the northern hemisphere become long nights and short days. And the longer a person spends in the dark, the higher the levels of sleep-related hormones in the body. Therefore resulting in more unspiritual state, then it is easy to cause emotional depression. At the same time, researchers also did a test, they let Europeans living in high latitudes to receive light treatment, the results found that these people who received light treatment, the relevant hormone levels dropped, due to seasonal triggers of depression also improved significantly. In this regard, experts explained that light can stimulate the retina, and the retina transmits this stimulating information to the nervous system, which in turn transmits to the part of the brain that is sensitive to light, and that part can then regulate the body rhythm and maintain mental health. For people who are experiencing severe cold, a good way to prevent winter depression is to chase the sun. For example, in some Nordic countries, many people will use their winter vacations to go to sunny places. For most people, it is more practical to make the most of sunny days and get more sunshine. If it continues to be cloudy, you may want to brighten the indoor light appropriately, especially at night, and not always stay in the dim light. In addition, to strengthen outdoor activities, go outdoors every day to walk. In daily life, close your eyes more often to relax your mind and body. In terms of diet, eat more fish, grains and green vegetables, etc.