About that article you talked about. Does it still apply to today? Because most of us well, a lot of us have homes which we can control the temperature. So since we don't face the same enviromental problems our ancestors had, does this change that hypothesis?
I live in canada, and it can get really cold here in the winter, but i'm a hard gainer. And it seems it's just based on genetics instead of enviroment.
I don't think keeping your house cold along with the rest of your environment would matter much Jebus. Typically evolutionary changes in organisms more complicated than single celled ones take many, many, many, MANY generations to happen (though not always). Who knows if temperature controlled households will nullify that theory. Tho, I am sure most of the world doesn't have air conditioning as widespread as the western lands do