Before you make your impulsive low IQ posts bother to read my post. By healthiness I don't mean extreme near death images that your small brain might form. I mean not being physically fit, poor frame,weak. As shown, actually using your brain is really taxing and the stress sooner or later takes its toll. You can't be both at your peak physical form and also your peak intelligence form. Thinking increases your stress a lot and its such stress that is not the physical working stress that builds your body. Its our planning ability that we abuse and even if we consume insane amount we still can't be saved from having our body deteriorating in favor of our mental capabilities. For an example, you need rest(sleep) for both of them but lack of enough sleep makes your brain coherency drop really quick and it just tries to use as less energy as possible. So to be intelligent in its ultimate form you can't be both fit like a lot of people claim. There are way too many traps about the whole thing that people for some reason don't want to look for.