Buy a bottle of metamucil or learn about the fiber content of fruits, vegetables, and whole wheats. Search enignes can help you find the fiber content of an apple, banana, spinach, etc. and just about everything else comes with nutritional guides on the label. You want soluble fiber.

What's your height? Weight does no good without height. Are you sure the test isn't using 50 ng/ml on immunoassay cutoff and 15 ng/ml on GC/MS confirmation?