Some people may need to be told that, much like some alcoholics are in denial about their condition. But many other fat people know they have a problem, are trying to solve it, and are struggling because it's incredibly difficult to overhaul your lifestyle (even with help and resources). While telling the first group of fat people "hard truths" might be what they need, it will simply demoralize the second group and might get them to stop trying. It's not as simple as you're painting it.