I'm sure you'll already have read "Fast Food Nation" - in which case you'll know that the insidious marketing of supremely unhealthy fod towards young minds who aren't yet developed enough to understand the long-term disadvantages of eating too much of it has been going on since the aftyer math of WW2. When was in California I noticed that San Francisco seemed to have a distinct lack of conspicuous obesity compared to Los Angeles, San Diego or even the far nearer Santa Cruz, so it doesn't surprise me that their governing body has taken the initiative on that issue. I initially attributed it to the fact that it's a small enough city for people to be able to walk everywhere, but after visiting the far smaller Santa Cruz and Monterey I concluded that it must have been down to a greater degree of health-consciousness.