According to this article eating honey can shorten the length of a cold by two days. A trial was conducted on 60 patients who were recruited within 24 hours of them catching a cold. All the patients were given traditional therapies such as decongestants and drugs to lower the temperature but half were also given four tablespoons of honey a day. At the end of the study the researchers found that the patients who had been given the honey had recovered from their colds much more quickly than the others showing a significant difference in the duration of all the symptoms. I will have to remember this, next time I am suffering with a cold.