If you are thinking about people "losing weight," you couldn't have thought of a 'skeletal' figure like Amy Winehouse. Here is Amy jugging in a park in London. The fact is that she is too 'bony' to lose any pound from the exercise.
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As skeleton as she looks, she would better off seating at home and eating fatty burgers. At least, that can transfigure her back to how she looked (right inset) three years ago. She had great appearance and posture back then. Now, she as trashy as she can get.