A - Because the business rates are cheapest on food outlets and staff can be hired cheaply (or free if you rope cousin Abdul in!)
B - Because our diet generally contains too much fat, sugar and salt, while exercise and activity levels are at their lowest ever. Obesity is not a result of wealth, but of poor nutrition.
C - Loads ! My 'garden' is small and all hard-standing, but I make a point of growing some food. It might only be a few spuds in 3 or 4 containers or a few tomato plants, but I make the effort. And I know lots that do - but I have still been known to eat cheap, crappy food on o