Men lose more weight in all-male environment, finds study.
They put their success down to the 'blokey banter' and lack of 'awkward moments' at the men-only sessions.
Those who followed an all-male course lost almost a stone on average, taking in those who missed some of the 12 weekly meetings.
In comparison, men who attend traditional slimming club meetings dominated by women lose on average just over half a stone.
Counting only those who completed the all-male course, weight loss rose to nearly one and a half stone and waistlines were reduced by almost two inches on average.
The European Congress on Obesity in Lyon, France, heard it was likely that some of the men were bashful about discussing their 'chubby' bodies in front of women.
However, they felt more secure in an all-male environment and their competitive spirit came to the fore.
For the study, 62 overweight men from the West Midlands attended weekly Weight Watchers meetings without any women.
Around two-thirds of the men completed the course and 77 per cent of these lost at least 5 per cent of their body weight. Many shed more than 10 per cent.
Researcher Professor Steven Robertson, of Leeds Metropolitan University, attributed the results to a sense of camaraderie, blokey banter and the feeling of being part of a team.
"A lot of the men did say that they felt a very female-dominated meeting might put them off contributing or talking about things that were important to them," the Daily Mail quoted Zoe Hellman, head of public health at Weight Watchers that funded the research, as saying.