This is grim:
“Magellan‘s crew, confined aboard their ships, relied on worm-eaten biscuits and flying fish that landed on the decks. They slowly succumbed to scurvy, which Magellan and other officers escaped by accident. Because of their rank, they were entitled to an allocation of jam made from quince, a tart little fruit rich in vitamin C. Without realizing how or why, those who had access to quince were protected.“