Hi I am 55 years old and had back surgery 10 weeks ago. After the surgery I could not get my strength back, I felt terrible and I lost about 15 lbs. I started eating more red meat and whey, fermented soy, egg white, and vegan protein. I feel great now but I am a little concerned with some comments that have been said about liver problems with so much protein. Are these concerns valid? I have kept the 15lbs off and am slowly getting back to the gym. I have a protein drink at least once a day. I also eat a lot of raw vegetables, and always put fruit into my protein drinks. I have had on occasion a slight white powder look to my stools. Since the surgery I have had trouble with constipation. I am almost totally off my meds. So, my questions are the one above, can protein cause liver problems? What is the best way to end constipation? I have tried most of the over the counter remedies and Rx remedies. I drink a lot of water.