When you say "we've been telling people to do that for decades" I'm assuming you're referring to the accumulated scientific wisdom that says eating healthily and getting exercise is good for your health, and not the trillions of dollars spent advertising addictive sugar water, alchohol, cigarettes, sugar coated cereals for kids, subsidized beef and corn syrup and attacking every health recommendation as lies if it threatened someones profits?

It might actually be worth telling people to eat healthily and excercise as a consistent message before we abandon the idea.