The government (and medical science) was wrong about what it told us to eat for the past 40 years.

Eating less and eating the right things is probably much more effective then exercising more (it takes a lot of work to burn up a donut)... But I'm not saying that exercise is not important for other reasons.

You're talking about small-scale, individual solutions... ones that you'd throw at a random obese person.

He's talking about a population level crisis. "People eat too much" doesn't answer the question anymore.

people believing there is some mystical cause to their obesity is the problem. People like to blame some magical undiscovered illness when they are just eating too much, eating too many bad foods, not exercising enough or a combination of those. there is no mystery to obesity but I do believe we can do more to educate people on better / healthier lifestyle habits.

Because people consume more calories than they need. We know this, we've known this for a very long time.