[gtt]

>This is a very strong claim that is lacking a source

They are citing overfeeding experiments.

[sasaf5]

There's a stretch between "overeating experiments fail to sustain body weight" and "diet doesn't cause obesity".

That kind of stretch is not even necessary for the main point of the article, so I think it is just decreasing its value.

Also I cast doubt on those overeating experiments: wrestlers and powerlifters keep fat.