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SnowGirl It's an individual preference.. Some guys like skinny girls some like them with with more flesh.. Might be hard for a girl to know if she is too fat if she lacks awareness as to the majority of guys like.. Girls just need to be observant as to what the most popular girls look like and what girls who never get approached look like..
There is a things that can muddy the waters with this.. If a girl is just a toxic nasty female then she will be approached less even if she has an attractive body.. While some very approachable woman may get some attention even if they are on the fat side..
There is also the problem of some people having mental conditions that cause them to either think they are too fat when they are normal and this causes them to starve themselves and on the other end of the spectrum people who think they are normal when in fact they are obese..
So lots of variables that can work to make this assessment difficult to get right..