Hello. Less than a month ago i had surgery to correct my scoliosis curve. During the procedure I lost a lot of weight that I am currently trying to gain back. I have always been thin and have had problems with weight gain but I find it now to be nearly impossible. I am on a diet where I eat 3 meals a day and in between drink Ensure Plus meal replacement shakes for extra calories (as recommended by my doctor). However, I have noticed myself going to the bathroom about 30 min to an hour after every meal. I think this is the reason I am not seeing any results. Could it be a stomach bug?