At the start of this experiment the average weight of these twelve highly selected female twins was 86 kg (13½ stone) and their average BMI was 34. Now, you might have predicted that the twin who had the willpower to diet regularly would have something to show for her years of sacrifice. Instead, I found absolutely no difference in weight between the twin who had dieted regularly for the past twenty years and her identical twin who had never been on a serious diet. Similar results were found in younger twins who started off at the same weight at the age of sixteen. The twin who had dieted was
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