I know what you mean, but sometimes you can't manage your body weight as easily as you would like to do. Stress and other conditions, without being serious illness, can make some people lose a lot of weight. It's not easy to avoid stressful situations in life, like a love loss, pressures at work, family matters, etc. I know it's not healthy, in the same way it's unhealthy when people gain weight overeating by the same stressful situations or other health conditions. What I find extremely unfair is that there is much more social tolerance towards people who gain weight unwillingly than for people who lose it in the same way. It's generally considered a serious discrimination making comments about obesity and weight gain, but most people blame a thin person for losing weight, they even insult them on their face for it, including recriminations, when they ignore what's hapening in the mind, the spirit and the body of that person.
That bitch Karl Lagerfeld should use a mirror before making comments about other people.