> Replicated by other studies, that research helps explain the discouraging finding that within five years of having lost weight, 95% of dieters will regain all the weight they lost. And most will gain a few extra pounds as well.

I'm part of that privileged 5%. I lost around 60 pounds in 2009-2010 and I've kept it off. It really is a lifestyle change. You have to be constantly aware of the portions you choose and remember what you've already eaten that day to keep in "budget". There are tools and processes that can help, but it's a constant struggle against your body that is constantly lying to your brain. I can definitely see why many people would give up.