I feel it would be accurate to say that obesity is also a metabolic problem. The difficulty with disentangling "what is obesity" is that the body is full of fe

I feel it would be accurate to say that obesity is also a metabolic problem. The difficulty with disentangling "what is obesity" is that the body is full of feedback and feed-forward mechanisms. You can look at any part of the machinery and say "here is the problem". There are a significant number of systems that deal with adiposity, hunger, and energy management and allocation. Once we find something to blame for a problem we often stop looking. Processed carbs are not compatible with a sedentary lifestyle, that is true. But our ancestors ate carbs for generations. Many modern cultures eat carbs and don't have a big problem with obesity.