Doctors, like policiticians, always feel the need to pontificate upon things about which they know little.
It is an interesting fact that the vast majority of GPs, from the time of qualification at about the age of 24 to 26 need undertake no further training from then until their retirement and in fact the majority only keep "up to date" with the information they may glean from reading the Lancet or from listening to the sales pitch of pharmaceutical company sales reps*.
*Source: Dr Vernon Coleman "How to stop your doctor from killing you" ISBN: 1 898947 14 7
As for this call to tax chocolate. It is proven that chocolate, in moderation, does more good than harm. As with all things excess is not beneficial but to increase prices by taxation would have no effect whatsoever on the incidence of diabetes (Type 2, because you are born with Type 1) or obesity. I do not eat chocolate, sweets or any sugar added products. Never have (well not since childhood) so how does this arse explain that I am Type 2 Diabetic and overweight? Well the diabetes is inherited and the weight problem is caused, as my consultant will confirm, by the medication to control the diabetes.