How do I know the fat jab works? Because I'm on it! SARAH VINE reveals how it has changed her life 

(February 12 23:33) Dailymail.co.uk

SARAH VINE: A 'miracle' drug had been found, we were told - one that's extremely effective at helping obese people lose weight. At last!

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How do I know the fat jab works? Because I'm on it! SARAH VINE reveals how it has changed her life&nbsp;