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A new book claims that almost everything we've been told about dieting is wrong - and microbes play a much bigger role than simply cutting fats or sugars.
Modern diets of highly processed and limited varieties of ingredients – in particular fast foods – are thought to be killing off some species of gut bacteria that keep us healthy.
Tim Spector is Professor of Genetic Epidemiology at King's College London and author of The Diet Myth: The Real Science Behind What We Eat and founder of the British Gut Project.