I must say, that fiber works differently on each individual person. I was eating extra fiber, cause i was following the Weight watchers diet with my husband, and holy crap, after about a month, I was in so much pain...i was in tears!
I was getting way too much fiber and my body was not liking it at all. After about of week of being in pain, my stomach finally settled down. But you better believe i won't be doing that again any time soon!
I try to eat fruits and veggies, but sometimes it doesn't always work with my tummy. It is a day to day thing for me.
So, i say just remember that what works for you, may not work for someone else. listen to your body! It's the best advice!