If I had scientific evidence I'd post it here. What happened happened and I have no explanation for it. All I do know is when I switched to organic, I can chug a gallon with no issues whatever. Take that as a hoax, placebo, I care not. I am just happy I don't blow up like blowfish excited. EDIT: I just googled this and it seems that SOME people have had the same experience as me while others are opposite, they are more lactose intolerant with organic milk than with conventional. So go figure.