Fiber

Aka: Fiber, Dietary Fiber, Roughage

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II. Indications

  1. Constipation
  2. Irritable Bowel Syndrome
  3. Diverticulosis
  4. Hemorrhoids
  5. Hypercholesterolemia
  6. Obesity

III. Physiology

  1. Dietary Fiber improves stool bulk and transit time
  2. Dietary Fiber lowers serum Cholesterol

IV. Precaution

  1. Fiber content listed below is approximate
  2. Various texts list different fiber per serving

V. Adverse Effects

  1. Use with 64 oz/day (>1.8 Liters/day) non-caffeinated fluid
  2. Poorly tolerated in atonic colon (e.g. Megacolon)
  3. Gas (bloating, Abdominal Distention, Flatulence)
    1. More common if started too quickly with high dosing
    2. Reduced by gradually increasing fiber intake to 225-30 grams per day
    3. Side effects more likely with dyssynergic Defecation
    4. Side effects are more common with insoluble fiber
      1. Insoluble fiber examples include (Methylcellulose, Citrucel, wheat bran)
      2. In contrast, soluble fiber (psyillium, Metamucil, oat bran) is associated with less gas

VI. Drug Interactions

  1. May interfere with absorption of medications
    1. Do not take medications at the same time as Psyllium
    2. Space Psyllium several hours apart from medications
  2. Agents known to be affected
    1. Carbamazepine (Tegretol)
      1. Etman (1995) Drug Dev Ind Pharm 21:1901-6 [PubMed]
    2. Lithium
      1. Perlman (1990) Lancet 335:416 [PubMed]

VII. Types: Dietary Fiber Sources

  1. Whole grain cereals or breads
    1. All-Bran or 100% Bran Cereal (>8 grams per serving)
    2. Wheaties (2.6 grams per serving)
    3. Shredded Wheat (6 grams per serving)
    4. Grits (5 grams per serving)
    5. Grape-nuts (5 grams per serving)
  2. Fresh fruits
    1. Raspberries (4.5 grams per serving)
    2. Fruits with 1-3 grams fiber per serving
      1. Apple with peal
      2. Orange
      3. Peach
      4. Pear
      5. Strawberries
    3. Fruits with negligible fiber
      1. Grape-fruit has only 0.6 grams fiber per serving
      2. Apple juice has no fiber content
  3. Vegetables (raw better than cooked)
    1. Beans (>8 grams per serving)
      1. Kidney beans
      2. Lima beans
      3. Navy beans
      4. Baked beans
    2. Peas (6 grams per serving)
    3. Corn on the cob (6 grams per serving)
    4. Parsnips (6 grams per serving)
    5. Lentils (4 grams per serving)
    6. Broccoli (3 grams per serving)
    7. Baked Potato with skin (3 grams per serving)
    8. Other vegetables with 1-2 grams fiber per serving
      1. Beets
      2. Cabbage
      3. Carrots
      4. Celery
      5. Corn
      6. Squash
      7. Green beans
      8. Turnips
  4. Other sources
    1. Whole wheat bread (1.3 grams per serving)

VIII. References

  1. Brody (1981) Nutrition Book, p. 147
  2. Cheskin in Barker (1995) Ambulatory Medicine, p. 479

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Related Studies

Cost: Medications

fiber (on 12/21/2022 at Medicaid.Gov Survey of pharmacy drug pricing)
FIBER LAXATIVE 625 MG CAPLET Generic OTC $0.07 each
FIBER TABLET Generic OTC $0.06 each
FIBER TABS Generic OTC $0.06 each
FIBER THERAPY 500 MG CAPLET Generic OTC $0.06 each
FIBER THERAPY POWDER Generic OTC $0.01 per gram
FIBER-LAX CAPTABS Generic OTC $0.06 each
FPNotebook does not benefit financially from showing this medication data or their pharmacy links. This information is provided only to help medical providers and their patients see relative costs. Insurance plans negotiate lower medication prices with suppliers. Prices shown here are out of pocket, non-negotiated rates. See Needy Meds for financial assistance information. GoodRx is another tool for finding lower drug prices.

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