James Lind's 1747 shipboard experiment is considered one of the first controlled clinical trials in medical history.
Eating Well
In 1747, a ship's doctor split twelve sick sailors into pairs, gave each pair a different treatment, and stumbled onto one of the first controlled experiments in medical history — using oranges and lemons.
Why This Matters
Long before food labels, vitamins, or nutrition science existed, sailors on long voyages kept getting sick with the same mysterious illness. Nobody knew why — or what, if anything, could help.
The answer took centuries to fully explain, but it started with a curious doctor, a cramped ship, and a simple idea: try a few different treatments and see what happens.
The Science Story
In May 1747, James Lind, a surgeon aboard the British ship HMS Salisbury, was surrounded by sailors suffering from scurvy — a disease that caused bleeding gums, exhaustion, and worse on long sea voyages. Nobody agreed on the cause or the cure.
Lind picked twelve sick sailors with similar symptoms and divided them into six pairs. Each pair received a different daily treatment — vinegar, seawater, cider, a medicinal paste, sulfuric acid drops, or two oranges and a lemon.
Within days, the sailors given citrus fruit were noticeably better. One was fit for duty within a week. It was one of the first times anyone had tested competing treatments side by side on a group of patients — decades before the term "clinical trial" existed.
It would take almost two more centuries for scientists to isolate the compound responsible. In 1932, biochemist Albert Szent-Györgyi identified the substance in citrus that made the difference: vitamin C.
Did You Know?
Vitamin C wasn't isolated as a specific compound until 1932 — nearly 200 years after Lind's experiment.
British sailors eventually carried citrus juice on long voyages so routinely that other nations nicknamed them "limeys."
Scurvy symptoms were recorded for thousands of years before anyone understood what caused them.
What the Coloring Book Covers Coming Soon
The Eating Well coloring book follows a ship's-deck detective piecing together clues alongside Dr. Lind, testing treatments, and discovering why some foods matter more than others. Kids color their way through an 18th-century ship, a fruit-crate mystery, and a timeline from scurvy to modern nutrition science.
For Parents & Educators
- Dr. Lind tested six different treatments on sick sailors at the same time. Why do you think comparing treatments side by side was such a useful idea?
- It took almost 200 years to figure out exactly what was in citrus that helped. What other everyday foods do you think scientists are still studying today?