Many obesity researchers find Guyenet to be quite the joke.

For example, Peter over at HyperLipid recently ripped him to utter shreds:

http://high-fat-nutrition.blogspot.com/2012/06/confused.html

http://high-fat-nutrition.blogspot.com/2012/06/insulin-un-de...

Not to mention, Taubes countered Guyenet with a 6-part series refuting Guyenet's widely mocked food-reward/palatability hypothesis:

http://garytaubes.com/2011/09/catching-up-on-lost-time-ances...

The thing is, there's a lot of infighting; These guys are always going back and forth. They both have their camps. Those both have their arsenal of studies. It's almost a sport...

The simple fact of the matter is that we're not really going to actually know conclusively and incontrovertibly one way or the other for at least another decade.