Peter Kay weight loss: Insiders say comedian has 'lost a lot of weight'

She is said to have followed a specific plan called the Sirtfood diet.

It was devised around foods that supposedly burn fat.

It is thought that sirtuins influence the body’s ability to burn fat, resulting in a seven pound weight loss a week while making muscle.

At the beginning of the diet followers are encouraged to drink green juice and eat 1000 calories a day.