I always find it interesting that sci-fi depictions of "evolved" humans (i.e. many years in the future) usually depict very tall, thin - even willowy - figures. That seems to fly in the face of general trend :)
Whereas for survival, you want humans that are small (so they need less food), weak because they have slow metabolisms, hairy to keep the heat in, fat because they are good at storing food in case of famine, cowardly so they avoid risk at any cost, dumb so they just repeat procedures that are known to work, and so on.