All my life I had drank semi-skimmed milk. I just preferred it. About 7 or so months ago I switched to skimmed milk, and over time came to prefer that. I had never even tried soya milk until a couple of months ago. Now I am at the point where I will have just one serving of skimmed milk in the morning, on my porridge (oatmeal) and substitute it wherever else with soya milk throughout the day. It has quite a very positive effect in my opinion. I think all the semi-skimmed milk in particular was slowing me down, especially when training hard twice a day I would feel noticeably sluggish on my evening training sessions. Now I find out soya contains estrogen. I am told this can have a negative effect on the male sperm (count??). What I would also like to know is does estrogen when introduced to the male system do anything else... like curb aggression or make us less likely to want to engage in physically intensive activity? I am afraid that if I keep drinking soya I will turn into a big girl!!! :icon_chee LOL.