With reference to the thread title, I disagree. To be pedantic, the thread title should be losing fat mass, not weight. I have gained weight in the last 6 months, but I'm not complaining as I've put on pounds of muscle and body fat at an all time low. You really have to be precise here, and I'd tell you why.
People associate losing weight with restriction, eating less, and other fads that the body easily adapts to, like "training" for a marathon, zumba, or playing a little badminton here and there. The idea is that, whatever tips the scale downwards, works. It is not so simple, and the weight you initially lose is typically not the type of weight you want to lose. Even in the long term, all these cardio activities fall flat on effectiveness.
Losing weight without understanding what is lost, and what side effects that might have on health is just like missing the forest for a tree. Easily remedied by reading up on articles that actually quote from scientific journals that are peer reviewed, but of course, most people who throw the term lose weight around loosely are usually too lazy to read up.
The key phrase is gaining a "healthier" body composition. That is at the very least, losing body fat without any decrease in fat free mass. For people like myself, I take it further to gaining as much muscle mass as I like/can.
So stop people in their tracks when they talk about losing weight, because they need to be clear what they are talking about. That might still not prevent them from embarking on unsustainable and unscalable "training", which is no better than a fad they would run out of steam for within a year.