Simon Cowell hasn't eaten a cookie since he turned 40. The 48-year-old music mogul has had to sacrifice his favorite calorific treats in order to stay in shape since his metabolism started slowing down.

Speaking at the London book launch of 'Michael Winner's Fat Pig Diet' on Wednesday night, Simon said: "Once you get to 40, you really have to be careful about what you eat. Cookies, cakes and chocolate are definitely off the menu."

Simon adhered to the smoking ban at the exclusive bash at the Belvedere Restaurant, in Holland Park, frequently popping outside for a quick cigarette. Other guests attending the launch included Sir Andrew Lloyd Webber - who left early because he had dinner reservations - TV presenter Cilla Black, light entertainment star Lionel Blair and actor Christopher Biggins.

Michael Winner, who remained seated throughout the evening as he is still recovering from a potentially fatal bacterial leg infection, joked about rumours circulating on the internet concerning his death.

He said: "Some of you may be surprised to see me here tonight. According to Wikipedia I died over the weekend! I even read a six-page obituary for me - which contained about 40 mistakes!"

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