There is masses of news at the moment about the obesity 'epidemic'. As someone who used to be a lot heavier than I am now (formerly 100kgs, now 84kgs) I know both the problems of being overweight, and that it is possible to change. I also tend to follow news about weight, diet, and fitness. So here is a digest of recent, eye-catching stories:
Rob Stock, writing at stuff.co.nz has this excellent, data packed, article on the costs of obesity - noting increased insurance costs and the costs of dieting. It is worth a look.
David Farrar at Kiwiblog questions the wisdom of Pigouvian taxes on foods and thinks individuals should be responsible for what they eat. He is also a person who was overweight and brought his weight down a lot.
The Economist has this research on the exercise component: weight in itself isn't always the problem. Like BMI it is a general indicator, but not always infallible guide, to cardiac fitness.
This researcher says that healthy eating is no more expensive than eating junk food. Link.