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Overweight patients told by their doctors to go to Weight Watchers lose around twice as much weight as people receiving standard weight loss care over 12 months, according to the findings of a study published on Thursday.

Ensuring a pound of butter is indeed a pound, or a gallon of milk a full gallon, has long been the province of government agencies that deal with weights and measures. But now it seems scientists are having a little trouble with the golf-ball-size piece of metal that is used to set the standard weight for a kilogram, or kilo.