BBC News: Atkins diet hedgehog slims down.
An overweight hedgehog has shed nearly a quarter of its body weight after adopting a high protein diet similar to the Atkins plan. George the hedgehog weighed 2.2kg (4.8lb) when staff at the Wildlife Aid Centre in Leatherhead, Surrey, discovered him in a volunteer's garden. He was put on a high protein diet in November before starting a daily exercise regime in February. He now weighs 1.7kg (3.7lb) shedding 500g (1.1lb) on the strict diet. Becky Banning, General Manager at the Wildlife Aid Centre, said George had originally grown overweight due to eating high fat foods intended for birds.
There's a photo of the chubby guy in the article, he looked too fat to curl up in a ball. Hedgehogs are terribly amusing.
Found the original article when they found him last November.