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Health Promotion & Maintenance25-38 g fiber/day

High-Fiber DietNCLEX cheat sheet

A high-fiber diet increases intake of whole grains, fruits, vegetables, and legumes to promote bowel regularity, lower cholesterol, and improve glucose control.

17 key facts 5 practice questions Reviewed Oct 2026
The 1-minute sheetCinnaRN

Who

  • Constipation, diverticulosis
  • IBS, ↓cholesterol, diabetes

Do

  • Whole grains, bran, oats
  • Fruits, veggies w/ skin
  • Legumes, beans, nuts

Teach

  • ↑Fiber slowly = ↓gas/bloat
  • ↑Fluid intake required

Avoid

  • Not in acute diverticulitis
  • Avoid in bowel obstruction
Red flag to remember

Abdominal distension, severe pain, or absent bowel movements may signal obstruction and must be reported.

Before you read

Test yourself first: 5 questions

Question 1 of 5

A client with diverticulosis (no active inflammation) asks how to prevent flare-ups. Which dietary teaching is correct?

What is high-fiber diet?

Recommended intake is about 25 to 38 grams per day. Fiber adds bulk and draws water into the stool, easing constipation and supporting gut health.

Key points to remember

  • Soluble fiber lowers cholesterol and slows glucose absorption; insoluble fiber adds bulk and speeds transit.
  • High fiber prevents constipation, diverticulosis, and helps manage hemorrhoids and weight.
  • Fiber must be increased gradually and paired with adequate fluid to avoid bloating, gas, and obstruction.
  • Whole grains, bran, beans, berries, and raw vegetables are key high-fiber sources.
  • A high-fiber diet is contraindicated in bowel obstruction, acute diverticulitis, and before bowel surgery.

Nursing priorities

  1. Encourage gradual fiber increase to minimize cramping and flatulence.
  2. Ensure adequate fluid intake, generally at least 2 liters per day unless restricted.
  3. Monitor bowel patterns and abdominal comfort.
  4. Teach selection of high-fiber foods across grains, fruits, vegetables, and legumes.
  5. Assess for conditions where fiber is contraindicated before promoting it.

Patient teaching

  • Add fiber slowly over several weeks to let the gut adjust.
  • Drink plenty of water as you increase fiber to prevent constipation.
  • Choose whole-grain bread, brown rice, beans, and fruit with the skin on.
  • Expect more frequent, softer stools and some initial gas.

Red flags: report now

  • Abdominal distension, severe pain, or absent bowel movements may signal obstruction and must be reported.
  • Never push high fiber during acute diverticulitis or suspected bowel obstruction.
  • Inadequate fluid with high fiber can cause impaction or obstruction.

References

Clinical references for this topic

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