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O'Farrell said his weight loss with the drug was "almost instant" and that, as well as losing more than five stone (34kg) so far, he has more energy and has been able to exercise for the first time in years.
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"I didn't know how things worked, the commute into work, that sort of thing.
Even though Langley has had two new hips in the last three years he said: "I was like a caged lion for months, because I can't sit still. Now that we're going again I'm ready."