Britain's Fattest Man is a television documentary broadcast on Channel 4 and 4HD on 5 January 2011.
It focuses on Paul Mason, who weighed 70 stone (980 pounds or 445 kilograms) and was the heaviest man in Great Britain until a gastric bypass operation saved his life.
The documentary follows a year in his life as he undergoes a risky operation to enable him to lose weight.
The documentary was watched by 2.63 million viewers on its initial broadcast, giving it an 11.3% audience share in its timeslot.
This article relating to a non-fiction television series in the United Kingdom is a stub.