If a female friend's been dumped, but insists that she's better off without "that jerk," check for signs of weight change. A broken heart affects people differently, so the change may be in either direction: loss or gain. If you've noticed more candy wrappers in her car than usual and her pants look a little tighter, that could be a sign of a broken heart. She's probably eating chocolates to dull away the pain. After all, chocolates are a girl's best friend.
If, however, you've noticed her picking at her salads when you go out and her face seems thinner than usual, that could also be a sign of the dreaded broken heart. Usually, this means she is too depressed to eat.