For the past few weeks I have been drinking protein shakes in skim/fat free milk several times a day, every day and I've been having serious stool irregularities. I've also been on the chanko diet for the same amount of time. I can't imagine the tuna and/or rice being responsible for this, so my only guess is lactose intolerance. How can i work around this? I don't want to cut milk out of my diet. Are there any pills out there for lactose intolerants? Any suggestions appreciated.