Fibre is a type of complex carbohydrate that’s found in all types of plant-based foods, including fruit, vegetables and grains. Fibre doesn’t get broken down and absorbed in your small bowel like other types of food. Instead, it passes undigested into your large bowel.
You might sometimes hear fibre referred to as two different types – soluble and insoluble. The terms soluble and insoluble refer to whether or not the fibre dissolves in your small bowel. In the past, soluble fibre was generally thought to have more effect in your small bowel, and insoluble fibre in your large bowel. But this isn’t always the case, and actually most food that is high in fibre has a mixture of both types.