I visit family in other states and I get comments like “I can’t believe you are so thin.” For context I am a healthy weight and I eat what I consider a reasonable diet. I sit and smile while I watch them drink soda and eat pure sugar and salt. I don’t care about your life choices but don’t act surprised by someone that’s a normal weight.
Only for a short period of time. You adapt and the effects go away since your body creates more red blood cells.
But then those athletes go down to sea level for a competition and have an advantage
For a few days as your body recycles the extra red blood cells
Yup. Go to high elevations, and until you acclimate you’ll feel a little off. Go to low elevations, and for the equal but opposite reasons you can run a marathon and outdrink anyone.