Fiber for Constipation: What Helps and What Does Not
Low fiber intake is one of the most common contributors to occasional constipation, and a few changes often make a difference within days to weeks.
Key takeaways
- Aim for 25 to 38 g of fiber a day and build up gradually.
- Fluids and movement matter as much as fiber.
- See a doctor if constipation lasts for weeks or comes with red-flag symptoms.
Why fiber helps
Insoluble fiber adds bulk, and soluble fiber holds water in stool, keeping it softer. Together they help stool move through the colon more easily.
Foods to emphasize
- Prunes and prune juice. Five prunes supply about 3 grams of fiber and also contain sorbitol, which has a natural laxative effect.
- Pears, apples, and kiwi with the skin on where possible.
- Beans and lentils. Start with small portions.
- Whole grains such as oats, whole-wheat bread, and bran cereal.
- Chia and ground flaxseed mixed into yogurt or oatmeal.
Do not forget the basics
- Fluids. Fiber needs water to work. Sip regularly through the day.
- Movement. Walking and other activity stimulate the gut.
- Routine. Try to use the toilet at a consistent time, such as after breakfast, and do not ignore the urge.
A common mistake
Piling on fiber while drinking little water can make things worse. Increase gradually, using the steps in this guide.
When to see a doctor
Get medical advice if constipation lasts more than a few weeks, alternates with diarrhea, or comes with severe pain, blood in the stool, unexplained weight loss, or vomiting. Constipation can also be a side effect of some medications and conditions.
This article is for general education and is not medical advice. See our medical disclaimer.