Just to add to the Bear's response, when I left home (when my mother forced me to eat fruits and veggies) for college, I felt so liberated foodwise that I had not eaten any veggies for fruits for about 10 years.

During that time with a very low fiber intake (the only fiber I derived was probably from peanut butter and spaghetti), I had never had any constipation issues what so ever.

This "regular" thing has always been a myth to me. Perhaps, my physiology is different, but I've enver needed roughage of any kind to maintain my bodily...er...functions.