Soluble vs Insoluble Fibre - 365 Cancer Prevention Society
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Soluble vs Insoluble Fibre

Soluble vs Insoluble Fibre

May 27, 2021
Written by: Stephanie Chua (Dietitian)
During cancer treatment, I go back and forth between constipation and diarrhoea. Is there any food which can help both conditions?

Question: During cancer treatment, I go back and forth between constipation and diarrhoea. Is there any food which can help both conditions?

Constipation and diarrhoea can be due to side effects of treatment medications, which cannot be solved by food alone. Talk to your doctor or pharmacist, as they may be able to adjust some of your medications to help reduce these symptoms.

In addition, getting the right type of fibre is great for normalizing bowel function.

 

Soluble Fibre

-Pectin, Gum

Insoluble Fibre

-Cellulose, Hemicellulose

Description

Easily dissolves in water. Attracts water and turns into a sticky soft gel-like substance during digestion.

Does not dissolve in water. Add bulk to stool and improve transit.

Suitable condition

Good for both diarrhoea and constipation.

Good for constipation only.
Limit intake of insoluble fibre if you have diarrhoea.

Food
Sources

  • Oatmeal / oat bran
  • Barley
  • Natural applesauce (no added sugar)
  • Apple, Pears (without skin)
  • Strawberries, Blueberries
  • Citrus fruits
  • Prunes
  • Finely ground flaxseeds
  • Chia seeds
  • Psyllium
  • Brussel Sprouts
  • Carrots
  • Onion
  • Chicory Root
  • Whole grain / whole wheat products
  • Brown unpolished rice
  • Green leafy vegetables
  • Seeds
  • Nuts
  • Skin of fruits
  • Skin of potatoes
  • Skin of vegetables
  • Corn
  • Celery

* Remember to drink more water, because adding fibre without adequate water can worsen constipation.

Beans, peas, and lentils contain significant amounts of both soluble and insoluble fibre.

Note: If you have severe constipation with pain, fever, or abdominal distention (bloating), seek medical intervention right away. Do not try to self-medicate with food.

In conclusion, soluble fibre is good for both diarrhoea and constipation, whereas food high in insoluble fibre is useful for constipation only. Besides consumption of dietary fibre along with adequate fluid intake, physical activity can stimulate bowel movement, and probiotics may help in improving gut immunity and gastrointestinal health.