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WessleWoggle said:

Who says my supermen have to be human? We can do whatever we want to their DNA, they only have to look like humans and be able to mate. My supermen would be made to require no food, maybe give them some sort of photosynthesis.

In which case they're not really "better" than humans, they're just different.

And nothing that uses photosynthesis is going to be able to... uh.... move. They just don't absorb enough enegry to be able to do that, even on the scale of teeny plants, which have a much higher surface-to-mass ratio than do things of our size. These seven-foot-tall men would have an even bigger problem - it's actually the same thing that would make them too hot for ome environments if they consumed food in the same way we do.