I think that we are all singing from the same song sheet in that lifestyle is as much to blame as anything and that means that taxing everything in sight will not work.
I hated it when my parents used to hark back to the 'good ol' days' and I have tried not to do it to my children, but there is an interesting contrast. The childhood of my parents was not that much different from mine, but the difference between mine and that of my children is immense.
We didn't have supermarkets, we had the Co-op. Sweets, tobacconist and newsagent shops shut at 6 or 6:30, just enough time for dads coming home from work to get an evening papers, some fags... and if we were lucky, a treat. Off-licences, pubs and off-sales were the only places to get booze, and they only opened in the evenings. Sunday's were shop-free days apart from the morning newsagents. We had children's hour TV then it shut down till the news at six - two channels. No iThis or iThat, no computers or X-Boxes, With all of that there was plenty of time for us children to make our own entertainment, we had to. Most entertainment consisted of running round like berserkers, riding bike or bogies or playing ball.
We didn't have time to get fat.
Interesting point about the smoking Ossie. It is almost a natural law to give up smoking and put on weight.