In the Regency era, women put wax pads inside their cheeks to make their faces fashionably plump. In the Edwardian, they constrained their rib cages and spines to the point of deformity with corsets. The 20s, thin was in. The 50s? Marilyn Monroe and curves were back with a vengeance, baby.
Now? It's The Age of Kardashian, where cosmetic surgery is considered an acceptable sixteenth birthday gift. 'Happy Birthday, sweetie... you don't have enough turmoil going on with your hormones, so here's new teeth/breasts/a nose/lips/skin colour to confuse you even more about what you should look like to be a happy, whole human being'.