It's impossible to stop obesity without destroying the entire sugar industry.

Flat out false, and I wish people would stop saying that. Including the part about grains.

Do you know what the fittest, lowest body fat, endurance athletes consume in mega doses? Sugar and carbs.

Is it an ideal diet? Not at all. But it's fuel, and it works when you need it to.

People are fat because they aren't justifying their caloric intake. They just shovel it in, even when they've exceeded the 1800 calories needed to just sit on their ass all day.

There is no obesity if you're active (excluding actual medical reasons like thyroid dysfunction or perscribed steroids).

Blaming "the industry" is as lazy as not wanting to be active.

Grain consumption, in case you weren't aware, is a keystone trait among the healthiest people in the world ("Blue Zones"). Grain consumption is also high in vegans, who happen to also have low (healthy) BMI.