Scurvy: the sailors' disease and the long-life cupboard

Scurvy is the disease everyone has heard of and almost nobody has seen. It is the reason a long voyage once meant losing men to bleeding gums and old wounds reopening, and it is the one real nutritional hazard in a store cupboard. It is also, in the NHS’s words, rare and “usually easy to treat”. Both of those things are true, and this page is about how they fit together.

What it is

The NHS defines scurvy as severe vitamin C deficiency, “caused by not having enough vitamin C in your diet over a long period of time”. Among the people it lists as more at risk are those who “have no fresh fruits or vegetables in your diet for a while”, which is the line that makes it relevant here.

The symptoms it lists include feeling very tired and weak all the time, joint, muscle or leg pain, “swollen, bleeding gums (sometimes teeth can fall out)”, red or blue spots on the skin, and skin that bruises easily. Without treatment, it says, scurvy “can cause serious problems and may even be life-threatening”. With treatment, “most people treated for scurvy feel better within days and go on to make a full recovery”.

If any of that sounds familiar, the NHS’s advice is to see a GP. This page is not medical advice.

How the navy beat it

The usual story has a Scottish naval surgeon discovering the cure, and the Admiralty issuing limes and turning British sailors into “limeys”. The real version is slower and more interesting.

1747: the trial. Aboard HMS Salisbury, after 80 of 350 sailors had gone down with scurvy, James Lind gave twelve sick men six different treatments in pairs: cider, dilute sulphuric acid, vinegar, sea water, a paste of garlic and mustard seed, and two oranges and a lemon a day. In his own words, “the most sudden and visible good effects were perceived from the use of oranges and lemons”. Then, very little happened. The James Lind Library itself says there is “little evidence, however, that Lind ever clearly recommended the use of lemon juice to the Admiralty or to others”. For keeping at sea, he recommended a concentrate made by evaporating fruit juice in nearly boiling water over several hours, which later analysis showed contained “practically no vitamin C”. Heat destroys it. Some historians doubt the trial happened as he described, because his patients do not appear on the ship’s sick list.

1795: the navy acts. Nearly fifty years later, a fleet well supplied with lemon juice preserved with alcohol reached Madras free of scurvy after nineteen weeks at sea. That, according to the same history, let the physician Gilbert Blane “persuade the Admiralty in 1795 to sanction the issue of lemon juice on a far more generous scale than ever before”. By 1815, only two cases had been sent to the naval hospital at Haslar in the last four years of the Napoleonic Wars.

1876: the Arctic, and a story we could not confirm. Scurvy struck the navy’s Arctic expedition of 1875–76 hard, and you will read in many places that this was because the navy had switched from Mediterranean lemons to West Indian limes, which carry less vitamin C. We looked for a source for that we could cite and did not find one. What the record does say is different. When Parliament debated the inquiry in 1877, the Commons heard that “out of 60 cases of scurvy, 58 occurred among the men in the sledging parties”, and that the navy’s own Medical Director General had specially asked for lime juice to go with them, “but it was not taken, even as a medicine”. The failure the inquiry found was not a weaker fruit. It was leaving the fruit behind.

It has not gone away

Scurvy is still diagnosed in England. Hospital figures given to Parliament in 2023 recorded 151 adult hospital episodes in 2022/23 where scurvy was a primary or secondary diagnosis. That counts episodes, not people, and it is a tiny share of admissions. The government’s own reading, in a 2024 answer to the Lords, is that most cases are “secondary to another health condition” affecting what someone can eat, “rather than it solely being caused by poor or inadequate dietary intake”.

So a tinned diet is not where modern scurvy mostly comes from. But the mechanism a ship’s crew ran into is exactly the one a long-life cupboard runs into, and it is worth understanding properly.

Why a cupboard needs to think about it

The NHS is blunt about the property that makes vitamin C different: “Vitamin C cannot be stored in the body, so you need it in your diet every day”. Adults need 40 mg a day.

Most nutrients in a store cupboard are generous. Protein is easy, calories are trivial. Vitamin C is the exception, because the classic long-life foods carry very little of it: lentils, pasta, rice, flour, oil and tinned meat between them carry next to none. Worked through properly from this site’s own recipes, a typical day falls well short of 40 mg. The arithmetic is in how long could you last on tinned food, and what to do about supplements is in do you need vitamins with a long-life diet?.

And how long that shortfall takes to become scurvy is a question we are not going to answer, because the NHS does not. It says only “over a long period of time”.

What keeps it off the menu

The sailors’ answer was citrus. A cupboard’s answer is several things, and none of them is exotic. From the composition figures behind this site, for one pack as you would buy it:

• A tin of sweetcorn, 325 g: about 78 mg. Nearly two days.
• A tin of mandarin segments, 298 g: about 60 mg.
• A jar of sauerkraut, 500 g: about 50 mg.

Potatoes are the one most people overlook. The NHS points out that “in the UK, we get a lot of our vitamin C from potatoes”, not because they are rich in it but because we eat so many. That extends to instant mash, which surprised us. CoFID’s figure for the dry powder, averaged across nine brands, is 130 mg per 100 g, which would put a 30 g portion close to a full day. Brands differ, and a national average is not a promise about the packet in your hand, so read the label. But it is worth knowing that the cheapest, lightest thing in the cupboard may be doing more for you than the fruit.

Heat is the enemy. Lind’s boiled-down juice failed because cooking destroys vitamin C, and the figures above are as the food comes, not as you cooked it. Eat tinned fruit cold, add sweetcorn near the end rather than at the start, and treat sauerkraut as something to eat alongside a hot dish rather than to cook into it.

That is the whole lesson of three centuries at sea, and it costs less than a pint: keep two or three of these in the cupboard, and actually eat them.