In Sydney, Australia, doctors have been seeing patients with a disease called scurvy. Scurvy is a disease caused by a lack of vitamin C, which you find in fruit like oranges and lemons. Sailors on long trips used to get it but you don't really hear about it these days. The doctors say it's due to poor diet – people not eating any fruit.
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http://www.bbc.co.uk/learningenglish/english/course/english-you-need/unit-9/session-2[Cover image: Getty images]