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Good gut health is essential to supporting our immune system – which is vital during the colder months as 70 per cent of our immune cells reside in our gut. These gut microbiota play a major role in our body’s defence system; they are the ‘gatekeepers’ to our immune system, training our immune cells which bacteria to fight off and which substances to leave alone. Essentially, the 'good' bacteria in our gut compete with 'bad' bacteria and viruses for space and nutrients. The gut microbiota helps to keep these bad pathogens at bay by stopping them from colonising.