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ScienceAlert - Just 2 weeks in the mountains can change your blood for months

The human body begins adapting to high-elevation environments as quickly as overnight, and these biological changes can last for months - even after the person has returned to lower elevations.

For the first time ever, scientists comparing the blood of mountain hikers have observed how multiple changes affect the red blood cells' ability to retain oxygen in low-oxygen environments - and it happens within hours.

The find contradicts an assumption that’s lasted for half a century suggesting that humans in high-altitude environments start producing new red blood cells that are more capable of supplying oxygen to their muscles and organs than the average human’s blood.