Advertising is only part of the problem, as is accessibility and price. You don't grow obese by eating a candy bar once a week, you have to turn your unhealthy food consumption into a pattern and patterns of behaviour are inherently difficult to change.

You can remove all advertising for candy and fast food and most people will still not lose any weight. At best you'll prevent new obesity cases by a tiny margin.

When actively trying to lose weight, the body and mind resist. Partially because change is hard, partially because you're running your bodies on fewer calories on purpose. There is the ever present feeling of "I could go for a quick snack but I really really shouldn't".

I don't believe there will ever be this One Secret Trick That Doctors Hate to losing weight (except for getting dangerously ill, perhaps). However, if research like this can lead to ways to reduce some of the symptoms of cutting calories, I think the world might become a lot healthier.

There is also always the risk of this being exploited, of course; I'd imagine some less than humane leaders would be all to pleased if their working populace wouldn't be complaining about hunger all the time. The brain exhibits this behaviour for a reason, probably a good one, and surpressing it willy-nilly can only end in disaster.