How can 1 Billion People Worldwide be Fat when We Spend 100+ Billion to be Slim?

It doesn’t make sense, does it?

Humans have never spent more on diets and gym memberships, yet people are fatter than ever.
Something is obviously wrong somewhere, right? This video explains a possible answer to this mind boggling dilemma.

What do you think? If people simply ate like the video says, would obesity be history?