Hmm. This is a bit like the discussion about the person who smoked 100 cigarettes a day and did not get lung cancer, but the person who never smoked gets it. These are the exceptions. I think there is lots of evidence that being overweight, eating all the wrong things, doing no exercise and building up fatty deposits in our liver and pancreas are definitely a contributing factors. But, it is also clearly also genetic and some people are simply predisposed, because as some of you have said, being overweight with bad habits is not the whole story - healthy slim people get it as well! Like many diseases we simply don't know why one person gets it and not another - but we do have some idea about who seems to be at risk!