Massive sugar taxes. Fructose is largely what behind the modern obesity epidemic. Closely followed by the shitty 'eat low fat' advice.

Your body weight is almost entirely controlled by your appetite, and that is heavily influenced by your genetics and what you eat . It's well known putting people on certain drugs can cause weight loss or gain.

Sugar screws up your insulin sensitivity and causes weight gain.

If you have crappy insulin sensitivity it's probable that if you eat a lot of carb you won't feel full when you should.

People need to eat less sugar and less carb. Affecting the cost of this is by far the easiest way to cut consumption.

Everyone thinks fat people are lazy pigs until something fucks up your appetite. So many steroid using patients have a 'oh' moment after being skinny their whole life.