I have noticed this whole food photography becoming more and more common. In many parts of Asia, its been an obsession for quite some time, you practically can't go out to dinner without first photographing the food and then blogging or posting about it. As for those who don't want people taking pictures of their food, have they not thought of it as a form of (free) 'word of mouth' advertising? One person goes out to restaurant, takes photo of dinner, posts to blog/FB/twitter, and then many more people see it and may be inclined to try for themselves. Of course this might also be negative if the dish is bad, but those places should be more concerned about improving quality rather than preventing people from spreading the evidence.