Japanese people are thinner.
if you look at Japanese-US dress size charts for example
a USA small is a JPN Medium,
Please remember that it is not about size/wieght that determens atractiveness in the primal parts of the male brain.
It is
shape (think coca-cola)
most clothing will look better/sexier if you got some hips.
also if you want to loose weight/get fit
please remember its not about eating less, its about doing more