Dieting almost always fails?

So I am getting very fed up lately. I have been reading many articles, like this one, that say how easy it is to lose weight but so much harder to keep it off. I don't know if they are just discussing fad diets or what. It took me a year and six months to lose 85 lbs through Weight Watchers and I always watch what i eat and excersise quite a lot. I like to think that weight will never come back. These articles always piss me off because I feel like it will discourage people from even trying anything at all since they aren't clear if they are discussing fad diets or what. Annoying.