I love Dr Jason Fung. His position is that our current system focuses on calories and not eating all the time, not avoiding processed foods, being insulin insensitive, and eating real food. Here's a good video: https://www.youtube.com/watch?v=OgmFEb0b0TI His hypothesis is that having high levels of insulin is the issue.

People need to remember that being insulin resistant and being overweight are chronic conditions. You won't be able to fix them overnight. Don't focus on decreasing calories, focus on eating real food. The article mentions this too.

One thing that was counterintuitive to me is that most people's bodies produce insulin in response to artificial sugar so there's no real difference between diet coke and coke on your body.