A food expert has revealed the “number one” thing you can do to bolster your immune system this winter. According to Professor Tim Spector, the founder of Zoe Health, there are four changes you can make to your diet to help ward off unwanted seasonal illnesses. Speaking in a video posted to his Instagram account, Tim advised people to focus on their gut health in order to stay healthy. He explained: “Winter's approaching and with it viruses and infections. “People are asking what can I do to

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