I have actually been on HD for awhile & have had no problems with it. Sometimes when I forget to eat my stomach might hurt and for the constipation issues you might want to try a probiotic. Walgreens makes a wonderful probiotic. It's called "Super probiotic with 20 billion active cultures. I do find that when I haven't went to the bathroom at least 1 time a day that I have a bad flare-up the next.