I've just read that in the new year, a new weight loss app is being released for trial in Wolverhampton. According to the article I read
"As part of a new anti-obesity scheme, they will be offered fitness trackers that monitor their physical activity, and an app that registers their shopping habits and calorific intake. By increasing their daily step count and improving their diet, they will be able to earn points which can then be spent in shops and cinemas."
It sounds a bit like the book someone on here recommended, and I cannot remember the title of, where all "bad" food was illegal and you had to hit your steps in order to watch TV. You got weighed when you went shopping and the government would decide if you could have butter or milk.
Good luck to anyone taking part though, it sounds interesting to do.