Men want a woman who has a figure – who fills a dress with curves and a feminine form. Of course to a large degree your size is determined by genetics. Some people are naturally thin. Some are naturally larger. So, it may be practically impossible for you to become thin, no matter how good your discipline or intentions. But having a “figure” – a certain proportion between your hips, waist, and bust – is most likely within reach (even if it is hard work getting there).
Honestly, that’s what we’re interested in. Many women quite rightly point out that Marilyn Monroe was a size 12 (or 16 depending on whom you ask) and that no one thought she was overweight. This is, of course, completely true and makes the point that proportionality creates the feminine form in the mind of a man.