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This is a (15) common belief, but scientists say there is nothing to (16) prove that it's true. However, the use of this vegetable as a natural (17) remedy goes back to the Ancient Egyptians, and research shows that it can be an effective (18) treatment for coughs, sore throats and upset stomachs, among other (19) illnesses. Unfortunately, many people dislike the smell, but you can take it in pill form. The truth is that people get colds from viruses, not from being cold. (20) However, keeping warm may help you to (21) avoid getting a cold. Researchers at Cardiff University's Common Cold Centre found that a fall in body temperature can (22) cause cold viruses to become active. In a (23) trial a group of people sat with their feet in (24) bowls of iced water for 20 minutes. A third of them developed colds in the next five days, compared to only 9% of another group who kept dry.