The CNN article seems not to justify the claim of "change". The experiment appears to demonstrate that obese people's brains do this, while non-obese people's brains do that, but the inference that the obese brains started out just like non-obese brains is unsupported.

So tired of these 'expert says'. Peer reviewed double blind studies is what we need

Obesity may damage the brain’s ability to recognize the sensation of fullness and be satisfied after eating fats and sugars, a new study found.

I think metabolic changes and hyper-palatable foods better-explain obesity compared to faulty satiety/fullness signals. Slow metabolisms due to age or genes combined with hyper-palatable foods, such as carbs and fats combined, are a recipe for obesity.