On a documentary I watched recently. According to scientist, People who will be born and raised on these close aired Martian colonies that don't exist yet will have a high beta carotene diet to boost their immunities from cancer causing radiation.

The high beta carotene diet means many people who will be born and raised in Mars will have orange skin.
Oh because the gravity will be lighter, they will evolve to be taller too. They can be taller up to 9 feet. A human who is born and raised on Earth and go back and forth on Mars but a person born and raised on Mars might have a hard time living on earth because they are taller so Earth gravity might be torture for them. Also they may not have immunities from Earth diseases since they live indoors all their life.









