scurvy

The Annual Register for 1763 tabulated the casualty list for British sailors in the Seven Years' War with France. Out of 184,899 men raised or rounded up for the war, 133, 708 died from disease, primarily scurvy, while only 1,512 were killed in action.

Before Lind's experiments, scurvy was not clearly defined as a disease.The term was used as a catchphrase to include all manner of nautical ailments.

A near-fatal case of scurvy being the only reason I can imagine drinking something with grapefruit juice in it.