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Prebiotics, probiotics and postbiotics explained

Three words that sound alike but do different jobs.

Written by David Starr, registered nutritionist (SENr)

Published · Last reviewed

Prebiotics: the food

Prebiotics are types of fibre your body can’t digest but your friendly gut bacteria can. Found in onions, garlic, leeks, oats, bananas, asparagus and mushrooms.

Probiotics: the bacteria

Probiotics are live microorganisms. Found in live yoghurt, kefir, sauerkraut and kimchi, and in supplements.

Postbiotics: the by-products

When bacteria ferment fibre, they produce compounds such as short-chain fatty acids. These are called postbiotics.

Why combine all three?

Adding bacteria (probiotics) works best when you also feed them (prebiotics). Postbiotics complete the picture. A supplement with all three is called a tribiotic.

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