4st 7lb is the threshold to death. It is said to be the weight at which no human can live any more.
This song contains the lyric: "Karen says I've reached my target weight - Kate and Emma and Kristin know it's fake - problem is diets not a big enough word." Those referred to are Kate Moss (model), Kristin McMenamy (model), Emma Balfour (model), Karen (Sky Agony Aunt).
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