俗话说“不常晒太阳,疾病找上门”,阳光是一切生物和人类生存必不可少的,特别是在冬季更是如此。有的人到了冬季情绪低落,容易疲倦,这与冬季太阳的照射随地球角度变化,光照强度和时间减少,以及冷暖风交替,特别是阴天较多有一定的关系。医学研究表明:在人的大脑底部,有个叫松果体的腺体,对太阳光非常敏感。它通过神经纤维与眼睛相联系,在阳光强烈时,腺体抑制松果腺体分泌减少。反之,在阳光强度减弱时,松果腺体兴奋,其激素分泌增加。有位医学专家做过一个实验而验证了这一点:他用黑布 As the saying goes “Do not often sun, disease door-to-door”, the sun is essential for all living things and human survival, especially in winter is even more so. Some people are feeling depressed and tired in winter, which is related to changes in the winter sun’s illumination with the angle of the earth, a decrease in light intensity and time, and the alternating cold and warm winds, especially the cloudy days. Medical research shows that at the bottom of the human brain, there is a gland known as the pineal gland that is very sensitive to sunlight. It is linked to the eye through nerve fibers, and the glands inhibit the reduction of pineal gland secretion during intense sunlight. Conversely, pineal gland body is excited when the sunlight intensity is weakened, and its hormone secretion increases. A medical expert has done an experiment to verify this: he used black cloth