[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"article-detail":3},{"lang":4,"article":5,"alternate":19,"related":20,"latest":29},"en",{"id":6,"slug":7,"title":8,"content":9,"summary":10,"thumbnail":11,"metaDescription":12,"metaKeywords":13,"created":14,"modified":14,"author":15,"authorEn":15,"categoryId":16,"commentCount":17,"thumbnailToContent":18},12581,"scurvy-vitamin-c-gene","Why Big Cats Never Get Scurvy but Sailors Did","\u003Cp style=\"margin:0 0 18px;\">In the wild, a tiger never touches fruit. It eats meat, drinks river water, and stays strong for years.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">Centuries ago, on a sailing ship crossing the ocean, grown men ate hardtack and salt pork — and their gums began to bleed.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">Both are mammals. Both have the same kind of body, the same kind of blood, the same kind of cells. So why does one of them thrive without fruit, while the other falls apart?\u003C\u002Fp>\n\u003Ch2 style=\"color:#111;font-size:21px;line-height:1.4;margin:28px 0 12px;\">\u003Cstrong>The Plague That Killed More Sailors Than Storms\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp style=\"margin:0 0 18px;\">Scurvy was the nightmare of the age of sail. First the gums bleed. Then old wounds reopen — injuries that healed years ago start bleeding again. Teeth loosen. Legs grow weak, bruises bloom without cause, and men who cannot stand are left to die below deck.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">It killed more sailors than storms, pirates, and shipwrecks combined. The crews did not know it yet, but they were not being attacked by anything. They were missing something.\u003C\u002Fp>\n\u003Ch2 style=\"color:#111;font-size:21px;line-height:1.4;margin:28px 0 12px;\">\u003Cstrong>The Missing Ingredient: Vitamin C, the Collagen Worker\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp style=\"margin:0 0 18px;\">That something is \u003Cstrong>vitamin C (ascorbic acid)\u003C\u002Fstrong>. Humans cannot make it, and it has one enormous job: building \u003Cstrong>collagen\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">Collagen is the body's glue — the scaffolding of your gums, your skin, your blood-vessel walls, and every healed scar. But collagen needs vitamin C as its assembly worker. Without it, the body simply cannot stitch collagen together properly.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">No vitamin C, no working collagen. No working collagen, and the blood-vessel walls in your gums weaken, wounds cannot knit shut, and old injuries fall apart. Scurvy is not a mystery disease. It is the slow collapse of the body's own scaffolding.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">\u003Cimg src=\"\u002Fattachment\u002F20260927\u002F74410ee6797a448187275aed50934b3b.webp\" alt=\"Scurvy symptoms — bleeding gums, reopening wounds, weak legs, sailing ship\">\u003C\u002Fp>\n\u003Ch2 style=\"color:#111;font-size:21px;line-height:1.4;margin:28px 0 12px;\">\u003Cstrong>The Gene That Quit: GULO\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp style=\"margin:0 0 18px;\">Now the twist. \u003Cstrong>Most mammals do not need fruit at all.\u003C\u002Fstrong> Their livers carry a working gene called \u003Cstrong>GULO\u003C\u002Fstrong>, which makes the enzyme that performs the final step of vitamin C synthesis. A tiger's GULO works. Its liver quietly produces ascorbic acid around the clock, which is why a tiger can eat nothing but meat and never develop scurvy.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">Humans have a GULO gene too — but it is a \u003Cstrong>pseudogene\u003C\u002Fstrong>: a broken, silent remnant. Millions of years ago the gene started mutating, lost its function, and has been \"slacking off\" ever since. Your body still carries the wreckage, but it produces nothing.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">\u003Cimg src=\"\u002Fattachment\u002F20260927\u002F0613266506b74009953558d132a509ba.webp\" alt=\"GULO gene working in big cat liver versus broken pseudogene in humans\">\u003C\u002Fp>\n\u003Ch2 style=\"color:#111;font-size:21px;line-height:1.4;margin:28px 0 12px;\">\u003Cstrong>Why Evolution Let It Break\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp style=\"margin:0 0 18px;\">Losing a working gene sounds like a disaster. In our ancestors' case, it was a bargain.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">Early primates ate mostly \u003Cstrong>fruit\u003C\u002Fstrong> — and fruit is packed with vitamin C. When your diet supplies plenty of a nutrient, the pressure to keep making it yourself vanishes. Mutations broke GULO, the broken copies did not matter, and the gene was quietly retired. The same deal happened in \u003Cstrong>fruit bats\u003C\u002Fstrong> (lighter bodies matter more in flight) and in \u003Cstrong>guinea pigs\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">Cats never made that deal. They are strict carnivores, and meat carries almost no vitamin C. For a tiger, a working GULO is a matter of survival — so the gene stayed on the job.\u003C\u002Fp>\n\u003Ch2 style=\"color:#111;font-size:21px;line-height:1.4;margin:28px 0 12px;\">\u003Cstrong>Citrus, \"Limeys,\" and the Modern Fix\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp style=\"margin:0 0 18px;\">By 1747, a naval surgeon named \u003Cstrong>James Lind\u003C\u002Fstrong> ran a simple experiment: he gave scorbutic sailors citrus fruit, and they recovered. Decades later, the British navy began issuing lemon juice to every ship. The sailors earned a nickname that stuck for centuries — \u003Cstrong>\"Limeys.\"\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">You will not develop scurvy today. But your body still cannot make vitamin C, so it has to come from food every single day. Cooking destroys it, smoking drains it, and the daily need does not go away just because the disease is rare.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">\u003Cimg src=\"\u002Fattachment\u002F20260927\u002Ffa1b8ce2ff9f41b687cf43c07ec57c13.webp\" alt=\"Vitamin C sources — citrus, pineapple, vegetables, sailor drinking lemon juice\">\u003C\u002Fp>\n\u003Ch2 style=\"color:#111;font-size:21px;line-height:1.4;margin:28px 0 12px;\">\u003Cstrong>Look at the Fruit Cells\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp style=\"margin:0 0 18px;\">Here is the strange part of the whole story: the vitamin that once decided life and death on the high seas is produced inside ordinary plant cells — and you can see those cells right now under a microscope.\u003C\u002Fp>\n\u003Cp style=\"margin:0 0 18px;\">Want to look at the cells that stash your vitamin C? \u003Cstrong>WWAI\u003C\u002Fstrong> is an AI-powered biology encyclopedia that answers your biology questions instantly and lets you observe real microscope slide specimens online — including a \u003Cstrong>pineapple fruit tissue specimen\u003C\u002Fstrong> where the fleshy cells holding sugars and nutrients are clearly visible. Search \"WWAI\" in your app store and download it today.\u003C\u002Fp>\n\u003Cdiv class=\"dp-template-card\" style=\"border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,0.1);margin:10px 0;max-width:100%;overflow:hidden;width:100%;\">\n \u003Ca style=\"display:block;text-decoration:none;\" href=\"https:\u002F\u002Fyun-hub.chat\u002Flink\u002F?app=wwai&clickid=stellarx&dplink=specimenid%3D1143\" target=\"_blank\">\u003Cimg class=\"image_resized\" style=\"display:block;height:auto;max-width:100%;width:100%;\" src=\"\u002Fattachment\u002F20260824\u002F5ba5dd3c38404fe785f43c44423830de.png\" alt=\"5ba5dd3c38404fe785f43c44423830de\">\n  \u003Cbutton style=\"align-items:center;background-color:#1f983e;border-radius:0 0 25px 25px;border-style:none;color:#ffffff;cursor:pointer;display:flex;font-family:Times New Roman;font-size:19px;height:40px;justify-content:center;padding:0;width:100%;\">EXPLORE NOW\u003C\u002Fbutton>\u003C\u002Fa>\n\u003C\u002Fdiv>\n\u003Cp style=\"color:#8a8a8a;font-size:13px;margin:0 0 10px;\">\u003Ci>References:\u003C\u002Fi>\u003C\u002Fp>\n\u003Cp style=\"color:#8a8a8a;font-size:13px;margin:0 0 6px;\">\u003Ci>[1] Lind J. A Treatise on the Scurvy. 1753. (Historic clinical record of citrus treatment.)\u003C\u002Fi>\u003C\u002Fp>\n\u003Cp style=\"color:#8a8a8a;font-size:13px;margin:0 0 6px;\">\u003Ci>[2] Nishikimi M, et al. Cloning and chromosomal mapping of the human nonfunctional gene for L-gulono-γ-lactone oxidase (GULO), the enzyme for L-ascorbic acid biosynthesis missing in man. J Biol Chem. 1994;269:13685–13688.\u003C\u002Fi>\u003C\u002Fp>\n\u003Cp style=\"color:#8a8a8a;font-size:13px;margin:0 0 6px;\">\u003Ci>[3] All illustrations are AI-generated.\u003C\u002Fi>\u003C\u002Fp>","","\u002Fattachment\u002F20260927\u002Fc4703000f9e94894824dac4e98e1fa51.webp","Why don't tigers get scurvy without eating fruit, while sailors died of it? A broken gene — GULO — explains vitamin C, collagen, and the story of scurvy at sea.","stellarx, wwai, scurvy, vitamin c, GULO gene, vitamin c deficiency","2026-09-27 18:34:10","Science Guide Wwai",77,0,true,null,{"prev":21,"next":25},{"id":22,"slug":23,"title":24,"categoryId":16},12595,"rabies-mucosal-transmission","He Never Got Bitten. Rabies Still Killed Him",{"id":26,"slug":27,"title":28,"categoryId":16},12580,"household-mold-health-risks","Three Years of Coughs, Endless Clinic Visits — Then Mom Opened the Wardrobe",[30,35,40,45],{"id":31,"slug":32,"title":33,"thumbnail":34,"categoryId":16},12685,"food-adulteration-history-bwxa","Ancient Food Was Never Pure: Urine, Lye, and Fake Fish","\u002Fattachment\u002F20261001\u002F03bbfa285e6545d6b3144a2fb3e790f9.webp",{"id":36,"slug":37,"title":38,"thumbnail":39,"categoryId":16},12684,"glowing-algae-story-zptc","When Lockdown Laziness Grew Glowing Algae","\u002Fattachment\u002F20261001\u002F2915a99ca6dd44bb99d4131bc2f639b5.webp",{"id":41,"slug":42,"title":43,"thumbnail":44,"categoryId":16},12683,"alpha-gal-syndrome-gmht","Why a Tick Bite Can Make You Allergic to Red Meat","\u002Fattachment\u002F20261001\u002Faa24a6f7e36b4b2fb5b8a0f6c3bfd1d8.webp",{"id":46,"slug":47,"title":48,"thumbnail":49,"categoryId":16},12682,"centipede-leg-count-comparison-lqzv","Who Has More Legs: House Centipede or Centipede?","\u002Fattachment\u002F20261001\u002Fb139d5c1b20648f39e4eca5fb29ac3f2.webp"]