And this is a reason we're really up against it in facing this challenge. Every ounce of advertising being thrown at people is trying to convince them to do the opposite - buy more, eat more, travel more, etc. And no government can work against that or they'll be reverted by lobbyists or destroyed by industry campaigns.

Same reason people struggle to manage their weight. There's no money in convincing people of the cheap/easy solution to buy and eat less. The pitches are always gyms and diets of specific foods and quick fixes. You don't see an article about a very reasonable size of hamburger or normal steak pancakes - it's always the 1kg steak or world-record pizza or a burger that you go on the honour wall if you complete. We're unsatisfied by small meals, they don't seem like value for money; tiny meals at high-end restaurants get ridiculed by the masses.