I'm not actually looking for advice, I was just wondering how on Earth it's done! I've been having the same conversation with a friend of mine for nearly a year and there is simply no way to convince her.
Is it even possible? :P
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Girls don't need to be convinced they aren't fat. That is more of a test than a real question. Learn to instinctively say no every time they ask if something makes them look fat. They aren't looking for an answer, they are looking for any hesitation they will use to make your life miserable for the next few days.