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In the Disney film "Wall-E," a colony of humans becomes an obese population after hundreds of years locked inside a spaceship. A lack of activity and an abundance of food left the starship denizens with little desire to stay in shape.

But while "Wall-E" was science fiction, but at least one anthropologist believes the human race will change when it embarks on multigenerational space missions to Alpha Centauri or other nearby stars.