You have given a reason that humans SHED hair. But you claimed that humans NEEDED hair to avoid overheating. (Quote - ". . . need that hair to avoid over heating".) Now you are giving reasons that people need that hair in hot desert climates. So you are saying two things here. One is that people need hair in desert environments to block sun - the other is that people cannot have hair in hot environments so they can dissipate heat. They seem contradictory. And your example of how bedouins need to wear clothing seems to argue against your claim that bare skin is preferable in desert/savannah climates. Now let's move on to the food issue: So honey, termites, bananas and papayas (for example) do not provide much energy?