I'm IBS-A and I've found fiber really good for keeping me happily in the middle. I started out taking Benefiber, and it worked well. But it was expensive, so when I heard they were changing the formula, I switched to Acacia. I think the Acacia is working even better, and I'm only taking about 2 teaspoons a day. I've also been doing extremely well on the EFI diet, although I'm still getting the hang of making adjustments when ever I start leaning to one side or the other.