Bob Mewse, 56, ballooned to 21st 3lb after years of feeding his sweet tooth with cakes, crisps and biscuits.
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Mr Mewse lost seven stone - the equivalent of 49 bags of sugar - following drastic changes to his diet and a strict regime of exercise.
He is now a svelte 14 stone.
The 'shocking' photograph captured Mr Mewse standing on the pavement opposite an Asda filling station wearing a tent-like grey shirt.
Mr Mewse, of Longwell Green, Bristol, said: 'I was horrified when I saw that photograph.