Are you drinking enough water? Are you getting *too* much fiber?
If you haven't already, start tracking your fiber intake on your nutrition page so you can see if you're getting too much. Regardless, make sure you're drinking water! If you increase your fiber intake but don't have enough water in your diet, it can definitely "block things up", so to speak, causing some gastrointestinal discomfort.
Also, those things aren't really the best breakfast... they don't have very much protein in them and have so much carbs (mostly from sugar!). Try having one of the 90-Calorie Fiber One bars *on the side* of a high-protein breakfast like greek yogurt or an egg white omelet.
Edited by: KALORIE-KILLAH at: 2/11/2011 (10:07)