“Death rates from both of these cancers [breast in women, colon in men] were about half as high at an altitude of greater than 1000 meters (3300 feet). The study also found about a 30% reduction in deaths from coronary artery disease at >1000 meters.
This accords well with a number of other studies. For example, “Lower Mortality From Coronary Heart Disease and Stroke at Higher Altitudes in Switzerland“. This study found 22% less heart disease death for every +1000 meters in altitude, and 12% less stroke death.
“Association Between Alzheimer Dementia Mortality Rate and Altitude in California Counties“: This study found about half the death rate from Alzheimer’s at an altitude of 1600 meters vs that at sea level.
There’s less diabetes at high altitude.”
Source: Higher Altitude Means Much Lower Death Rates – Rogue Health and Fitness