Hi,I know about 5 years ago I read a bunch of article from a GI Doc that swore he could cure anyone of IBS-C or D with enough Fiber added to the diet. He was proposing 9 Tablespoons of Metamucil each day. The recommended dosage of Metamucil is 3 tablespoons each day. He swore by that.I'm not sure that it's possible to OD on fiber (take a Vegan-Vegetarian for example....they eat almost an entire diet of fiber everyday.)I would think that in the beginning the more fiber you eat the more gas you may get.I know I use 3 tablespoons of metamucil everyday and still eat any other fiber that I want without concern.