The concept of losing weight is a disasterous over-simplification of the obesity problem. It is not bodyweight that's important - it is body composition that is key, which is far more complicated. It is not losing fat that is important - it is keeping it off that should be the goal. Losing bodyfat - the delta itself - is always a Bad Thing, albeit a necessary evil for anyone who is fat. Starvation, no matter how slight, takes a toll on the body. Losing weight is a cost, not a benefit, and it is certainly should never be a goal.
We should be celebrating weight loss like we celebrate cancer surgery - "Gee, sorry to hear that you had to go through it but let's hope the problem stays away. Let's have a party at your 5-year anniversary."