Sauna as editor: what heat does to the aging marks in your blood
The hot air of a sauna makes your heart beat faster and your blood vessels widen. But under the skin something less obvious happens: heat leaves marks on the packaging of DNA. These marks are chemical tags that do not change the text of the genes themselves, but they influence which pages get read. For the first time, scientists have checked how regular sauna use rewrites such marks in living people.