For most of human history, sailors did not get scurvy.
The Vikings, the Polynesians, the Inuit who travelled the Arctic, all conducted long sea voyages on diets that contained essentially no fruit and no vegetables. They did not develop scurvy because their diets contained large quantities of fresh and lightly preserved animal foods, which contain vitamin C in adequate quantities. Raw meat. Liver. Fermented meats. Fish, eaten head, eyes, and all. Whale blubber. Seal kidney.
Then in the late 1400s the great European voyages of exploration began, and an interesting thing happened. The sailors started dying. They died in numbers that defied belief. Between 1500 and 1800, scurvy killed an estimated two million sailors. More than enemy action. More than storms. More than any other cause combined.
Why?
Because the European ships had switched to provisioning with grain. The ship's biscuit became the staple. Salted pork, salted beef, dried peas, and ship's biscuit. The fresh meat and the offal and the fermented dairy that had sustained earlier seafarers was eliminated in favour of the cheapest, most calorie-dense, most shelf-stable foods the navy quartermasters could source.
The diet was technically calorically sufficient. It was nutritionally a catastrophe. Within six weeks of leaving port, the men's gums would start to bleed. Within twelve weeks, old wounds would reopen. Within sixteen weeks, men would be dying.
The cure was lemons. James Lind worked it out in 1747. The Royal Navy refused to adopt it for another forty-eight years, on cost grounds. By the time they did, hundreds of thousands more had died.
The lesson available to anyone willing to look:
A diet that removes animal foods in favour of grain-based staples will kill you. It killed entire fleets of men. The vitamin deficiencies arrive in a specific order, and the death is preventable, and the populations that ate the meat had no idea what scurvy even was, because they had never seen it.
You are now being told that grain-based diets with minimal animal foods are the healthiest option.
The sailors who died were eating exactly that diet.
Their teeth were falling out by the third week.
Have a think about who is repeating the experiment.