Need to spend less time & energy pushing for a fat tax in a turbulent recessionary period where its sure to make getting by even more difficult for the poorest and hardest hit and put more effort into practically supporting people to adopt and maintain all-round healthier lifestyles in their localities. If the clamour was for Govt to shift from picking up the tab for junk food to actually subsidising the cost of healthier foods , fair enough , although as you state , there's always a risk of dire unintended consequences when trying to rig prices , but that's not what the usual suspects are pushing and the real 'double whammy ' here is that people struggling with weight problems and very often poverty too are caught between half-hearted public health gestures to support healthier lifestyle change and , often from the same people responsible for that half-heartedness , a punitive OTT control agenda based on dodgy economic reasoning , wild exaggeration & networked scaremongering. about the coming 'Fatocalypse' masquerading as good science. .
Try again: Place a heavier tax on the manufacturers that produce food with a high fat or carb content.