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Peanut allergies often start in childhood and can be lifelong. For those affected, even coming close to peanuts can cause a violent reaction and even be life-threatening. Presenter Claudia Hammond talks to Jen about living with a severe peanut allergy and her experiences of going through experimental desensitisation therapy, which involves eating gradually increasing micro doses of peanut. Photo: Peanut butter with warning logo Credit: Getty Images