MacLeod wrote:

How much of a difference in gravity would there have to be before it become problomatic for humans. .2G, .5G, 1G, 2G?
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I would go with the limit of 1.6G (meaning a difference of 0.6G from Earth gravity), as a sustainable gravity - no idea about the maximal.
But I base this on average/overweight difference, not on actual studies.