What really causes obesity?

I have read 3 books on WLS. One of them stated besides being genetic, that, in an obese person, when the food reaches your duodenum, it tells your brain to hold onto more fat cells than a "regular" person, thus, that is why it is a disease and not a lack of willpower or laziness, however, I haven't seen that reasoning in any other books or research. I presently lent this book to someone so this is not verbatim. Any input is greatly appreciated. Thank you.

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.

You must be logged in to post an answer. Click here to log in.