GUYS: How important is it for a girl to be very thin?

I'm curious because a lot of times guys seem to go for very thin girls who otherwise aren't that attractive in my eyes instead of an average weight girl. I have a decent body, and I take care of myself as in do my hair and dress nice. Is that good enough or do I need to starve and lose weight to get a guy to like me as more than a friend?
GUYS: How important is it for a girl to be very thin?
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