Do guys notice weight loss in girls?

Recently I took up boxing and within the last week alone I have lost eight pounds alone. I have always been quite strong but my body has always been "soft," never lean; with boxing I can already see an increase in muscle definition. I was just curious to see whether guys, after some time, would notice this change as well? And would this change make a girl appear more attractive?
Do guys notice weight loss in girls?
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