Truthfully, everyone knows how to eat right. They know the difference between oatmeal and a jelly cream doughnut. They know how to walk. Everyone has this in their brain. When I started, we didn't have all this knowledge. Forty years ago, I lost my weight, but only by watching what I was eating.
Unlike fiction, which you create before you go into production, with reality you kind of create it after everything is produced. The drama and the storytelling is really done in post.