Great article by Maciej Ceglowski  on scurvy– how the cure was discovered two centuries ago, then lost.  The Antarctic expeditions were plagued with scurvy, despite the best scientific advice of the time.

http://idlewords.com/2010/03/scott_and_scurvy.htm

The basic problem turns out to be that a solution was found (lemon juice) but no one knew why it worked– no one knew about vitamin C.  So the British Navy in the mid 1800s switched from lemon juice to lime juice, which was cheaper… not realizing that the limes they used had far less vitamin C.  And that in turn cast doubts on the citrus cure, and that led to more trouble…

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