I can easily imagine a world where noöne lives in poverty, and if that costs anyone living in wealth, I'd make the change.

However, it is still possible to be "rich" without beggaring your fellow human beings, and in post-scarcity (the kind of place where an epidemic of obesity can occur) world, that will probably happen.

I care not how rich you become, but only when no child is deprived of universal basic infrastructures.