Dietary fibre series- soluble fibre

Dietary Fibre Series- Soluble Fibre

Erin Dwyer - Research Dietitian, 28 October 2016

Eating enough fibre on a low FODMAP diet can be challenging, but did you know that getting the right mix of fibres is also important? Food is made up of different types of fibres, namely insoluble fibre, soluble fibre, and prebiotic fibres (including resistant starch). 

These fibres serve different functions in the bowel and eating them in combination may promote different health benefits. Over the next few weeks we will discuss the different fibres types, including their function in the bowel and low FODMAP food sources. Let’s begin with soluble fibre.

Soluble fibre dissolves in water and forms a thick gel in our digestive tract. This slows gut transit time and helps us to feel fuller for longer. The gelatinous substance formed by soluble fibre also acts like a sponge during digestion, attracting fluid and softening stools to make it easier for waste to move through the bowel.

There are many health benefits associated with including soluble diet in your diet. Soluble fibre helps to stabilise blood glucose levels in people with diabetes. Soluble fibre may also lower levels of low density lipoprotein cholesterol (LDL-C), also known as bad cholesterol level. This may reduce risk of heart disease and bowel cancer. For those with constipation predominant IBS, including a variety of fibres in your daily diet can assist with maintaining regular bowel habits.

What foods contain soluble fibre?

Soluble fibre is found in some vegetables and fruit, oats, lentils, legumes, nuts and seeds. Including small quantities of these foods may improve stool consistency, but avoid large quantities which may exacerbate symptoms. 

Dietary Fibre Series- Soluble Fibre_5987db6a

Fibre supplements such as psyllium husks are also rich sources of soluble fibre. However, being fermentable, psyllium husks are tolerated by some people with IBS, but not all, so include in small doses initially and/or under the guidance of your dietitian.

Here are a few examples of foods you can trial in your diet to increase your soluble fibre intake:

  • Breakfast: Add 30g of rolled or quick oats to your yoghurt or breakfast smoothie in the morning
  • Snack: Have a fruit such as orange, passionfruit or banana.
  • Lunch: Include wholegrain bread, brown rice or beans as an element of your meal
  • Snack: Try a handful of low FODMAP nuts and seed
  • Dinner: Include a variety of vegetables into your meal. High soluble fibre options include: brussels sprouts, sweet potato, turnip, collard greens, eggplant, carrots, potato, okra and green beans. Refer to the Monash app for serving size suggestions.
  • Dessert: Try making a chia seed pudding:
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