Whether thin is attractive or not! I dont give a damn to anybody's opinion. I think i have a short life and want to enjoy, especially with the world cuisine coming in.
I think one should diet but not for becoming in the eys of society but for her sole well being. Maintain wieght, exercise so that in the long-term you dont become a victim of illneses like heart-attack, oestoporosis, diabetes, ...etc
After all everyone wants to extent their short-life and during their ending days want people to remember for other reasons rather than 'oh Thank God! He finally relieved her form such pains'