Video: A successful mission starts with nutrition

Centuries ago, large, wooden ships explored the seven seas. But often a ship that began its voyage with a crew of hundreds could return with tens. The silent killer? Scurvy, a disease that occurs when there's a lack of Vitamin C in the diet. On the other extreme, explorers of the North and South poles could fall ill by eating the liver of polar bears and seals, exposing them to toxic levels of Vitamin A.

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