Thinness is beauty?

One of these days I saw a poster a known actress, smiling, sporting a weight loss shake. Right. The girl is really thin, but what draws attention to her is not thinness but its radiant beauty. That's the point. Advertising explores the current paranoia that thinness became synonymous with beauty. Never has a possible side effect thinness will bring the beauty of that actress. Of course, weight loss (healthy) is always welcome, considering that obesity appears as a public health issue. But here we are talking purely for appearance and a beautiful person not only for being thin. Never heard men talking about: man, that woman thinner! Likewise I can not imagine women feeling attracted to a skinny man. Maybe even only women notice the thinness of each other, but do so by a sense of competition fostered by the illusion that thinness is even synonymous with beauty.
Aesthetically, beauty is the harmonious result of various physical characteristics. That is obvious. The problem is that just paranoia will not let us see what is obvious.