Even a warm day increases the risk of dangerous heart diseases. Heat weakens the immune system and promotes inflammation in the body, researchers have found.
Intense sizzling in the heat can lead to sunstroke, sunburn and, in the long term, skin cancer. The study was based on blood samples from 624 participants in the Louisville Green Heart Project. The average temperature on the days the blood samples were taken was 24.5 degrees. Inflammatory markers in the blood already increased after one day in the sun.