I find it difficult to eat enough fruits and vegetables. Is there any harm in taking a fiber supplement every day?
Answers from Michael F. Picco, M.D.
There's no evidence that daily use of fiber supplements — such as psyllium (Metamucil, Konsyl, others) or methylcellulose (Citrucel) — is harmful.
Fiber has a number of health benefits, including normalizing bowel function and preventing constipation. It's best to get fiber from food, because supplements don't provide the vitamins, minerals and other nutrients that fiber-rich foods do. But fiber supplements can contribute to the recommended daily intake.
Fiber supplements can cause abdominal bloating and gas, at least initially. So if you have intestinal problems, talk to your doctor before adding a fiber supplement to your diet. It's also a good idea to ask your doctor or pharmacist whether fiber supplements interact with any medications you take.
Fiber supplements can decrease the absorption of certain medications, such as aspirin, warfarin (Coumadin) and carbamazepine (Carbatrol, Tegretol). Fiber supplements can also reduce blood sugar levels, which may require an adjustment in your medications or insulin if you have diabetes.
If you plan to take fiber supplements, start with small amounts to avoid problems with gas and be sure to drink plenty of fluids every day.
Nov. 21, 2012
See more Expert Answers
- Duyff RL. American Dietetic Association Complete Food and Nutrition Guide. 4th ed. Hoboken, N.J.: John Wiley & Sons; 2012:63.
- Slavin JL. Position of the American Dietetic Association: Health implications of dietary fiber. Journal of the American Dietetic Association. 2008;108:1716.
- Picco MF (expert opinion). Mayo Clinic, Jacksonville, Fla. Aug. 21, 2012.
- Methylcellulose. Lexi-Interact. Lexi-Comp. http://www.uptodate.com/crlsql/interact/frameset.jsp. Accessed Aug. 21, 2012.
- Psyllium. Lexi-Interact. Lexi-Comp. http://www.uptodate.com/crlsql/interact/frameset.jsp. Accessed Aug. 21, 2012.
- Blonde psyllium. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Aug. 21, 2012.
- Wald A. Management of chronic constipation in adults. http://www.uptodate.com/index. Accessed Aug. 21, 2012.