[BlackJack]

I upvoted this comment, but people are not so dumb to only eat junk food. There are environmental/psychological factors why people overeat. Other research shows that people will overeat "healthy food" i.e. huge dollops of olive oil, or fruit juice, because it's "healthy."

I agree that reducing bad food and portion control is the answer, but it's very hard to drive behavioral change in people. And the health industry has done a "good" job of creating medication to enable bad lifestyles i.e. metformin for Type2 Diabetes, other drugs to manage cholesterol, etc.

[nradov]

There's no evidence that a diet high in olive oil increases obesity or all-cause mortality.

[caylus]

There's plenty of evidence that eating too many calories increases obesity.

GP's point is that calories coming from a "healthy" source doesn't mean they don't count. Drenching one's salad in olive oil rather than canola oil won't help someone lose weight, nor will switching from soda to a fruit juice with the same amount of sugar in it (ancillary benefits of e.g. vitamins notwithstanding)