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Researchers say the cause of severe morning sickness is genetic - not in the mind. The condition affects 1 in 100 pregnant women, including the Duchess of Cambridge. In its most serious cases, sufferers report being sick up to fifty times a day. Up until now, it's been unclear as to what causes it, but scientists from the University of California think they've made a breakthrough. Lead researcher Marlena Fejzo spoke to the Â鶹Éç's Alex Ritson. Picture: Lead researcher and morning sickness sufferer Marlena Fejzo, drawn by her sister. Credit: Marlena Fejzo