Choose the diet appropriate for the life stage of your rabbit to ensure adequate fiber intake, and avoid high simple - carbohydrate foods such as excess corn. (articles.extension.org)
Without adequate fiber to stimulate digestion, food can sit stagnant inside your bun's gut for long periods of time. (petconsider.com)
You are probably getting adequate fiber in your diet of you are managing your weight and not putting on extra pounds. (healthyeating.sfgate.com)