Why would they be? Human metabolism evolved for hot climate after all. So, the body can regulate itself. Unless it's infected by a virus, which alters this regu

Why would they be? Human metabolism evolved for hot climate after all. So, the body can regulate itself. Unless it's infected by a virus, which alters this regulation. And, unlike you imply, living in a hot country does not shift your energy usage towards fat creation like the virus does.