Back in 2005, 50 stone Barry Austin cut his daily intake from 29,000 calories to 1,500 in an effort to lose weight after he took part in a documentary to be showed on TV.

Barry Austin.
By April 2006 there is a report of him weighing 45 stone.
Source. But there is very little information other than that how he is doing lately.
There's bugger all on the web, not that I can find anyway BUT I did manage to find his bebo account which is recently active and it shows what I am assuming is an up to date picture. It doesn't look as though he's reached his goal of 18 stone just yet but he is still smiling.
Barry's bebo