Why More People Get Sick in the Winter

Rates of colds, flu, heart attack, stroke, autoimmune disease and psychiatric illnesses are much higher in the winter than in the summer. Researchers from University of Cambridge in the United Kingdom found increased activity levels of genes controlling the immune system during colder times of the year. They examined immune system activity in the United Kingdom and Gambia (located in Africa) during different seasons of the year. Inflammation, which is linked to poor metabolic health and the long-term risk of heart attack and stroke, was higher during the colder months. The cold months of the year can be dangerous for your health. (Nature Communications, published online May 12, 2015)

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