Tesco runs Britain's largest online diet service Tescodiets.com, which is used mostly by women.  However, this week Tesco is launching "for him" pages specifically designed for men who want to lose weight.  The amount of people who have signed up has doubled in the last six months.  It has gone from 4,500 to 9,000 in just six months.  Alison Henbest,  Head of Tescodiets.com, said "Online men can lose weight in private without having to endure the embarrassment of the weekly weigh-in." Dr Colin Waine, Chairman of the National Obesity Forum said "I welcome the news that men are becoming increasingly aware of the impact of obesity on their health."