According to the BBC : "Seven new gene variants discovered by scientists suggest strongly that obesity is largely a mind problem. The findings suggest the brain plays the dominant role in controlling appetite, and that obesity cannot easily be blamed on metabolic flaws."
Read : http://news.bbc.co.uk/2/hi/health/7783088.stm.
As long as we do not gobble up all the bull sh** and horse manure we read in the press or see and hear in the media, we are quite safe I think. By the way, I prefer cake to ice.