What are Prebiotics? (and where to find them)
Prebiotics are a source of food for probiotics to grow, multiply and survive in the gut. Because they are fibres they cannot be absorbed or broken down by the body, enabling them to nourish friendly bacteria, particularly the Bifidobacteria genus, to increase in numbers.
Prebiotics in food
Prebiotics occur naturally in our diet and prebiotic fibres can be found in jerusalem artichokes, garlic, chicory, and onions amongst other things. One may have to eat large quantities of these foods to have a ‘bifidogenic’ effect – that is to increase the levels of friendly bacteria in our intestines. For this reason many people find it easier to take a prebiotic supplement, or a combination probiotic and prebiotic supplement (called a synbiotic) to ensure they are feeding their levels of friendly bacteria.
Research shows that there are different types of prebiotics, in a similar manner as there are different types of probiotics. With prebiotics, the key differentiating factor is the length of the chemical chain – short chain, medium chain or long chain determines where in the gastrointestinal tract the prebiotic has its effect, and how the benefits may be felt by the host.
Common prebiotics include inulin, Fructooligosaccharides (FOS), galactooligosaccharides (GOS), lactulose and lafinose. An expert panel convened by the International Scientific Association in 2017 agreed on the following definition: 'A probiotic is a substrate that is selectively utilised by host microorganisms conferring a health benefit'1.
Prebiotics in our range
Within the OptiBac Probiotics range, the prebiotic FOS can be found in 'For every day', 'One week flat' (formerly called 'For a flat stomach'), 'For babies & children' and 'Bifidobacteria & fibre' (formerly 'For maintaining regularity'). Fructooligosaccharides prebiotics are low molecular weight carbohydrates which promote the growth of beneficial bacteria. FOS is probably the most researched of the prebiotic fibres.
For more information on prebiotics, healthcare professionals can read the in-depth article and research analysis by Dr Georges Mouton, 'The Uses of Prebiotics'.
NB: In some cases, prebiotics can cause minor disturbance / flatulence in the first few days of taking them… but after a few days of continued use (once the intestines have adapted to the prebiotics), this discomfort tends to disappear. Many practitioners make their clients aware of this when recommending prebiotics, especially in higher doses.
For more information about this, see our FAQ page: Are there any side effects from taking live cultures?
For more in-depth information about prebiotics, see :Probiotics & Prebiotics