I have no evidence beyond personal experience to back this up, but I was on the Ideal Protein program for a little over a year and in that time my long term average loss was 3 lbs/week. In comparing notes with folks in an active FB group, who are mostly women, it seems that most women averaged closer to 1.5 - 2 lbs per week eating the same diet. But, there are outliers with higher loss, so while I would agree that men lose faster, it is dependent and the individual as well.