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# The Tin With More Calcium Than A Glass Of Milk
- URL: https://the-healing-plate.ghost.io/the-tin-with-more-calcium-than-a-glass-of-milk/
- Published: 2026-09-28T16:00:16.000Z
- Updated: 2026-09-29T12:20:34.000Z
- Description: Sardines cost about a dollar. Here's what's in one, and the honest state of the omega-3 research.
- Author: The Healing Plate
- Tags: Sardines

| There's a tin at the back of most cupboards that nobody opens. It costs about a dollar and needs no cooking. And it may be the best value in the whole shop. The catch is the bones, which you're supposed to eat. That turns out to be the point. Let me make the case… What's In One Tin Take a standard small tin, drained, about 92 grams of fish. You get roughly 191 calories and 23 grams of protein. Then there's about 350 milligrams of calcium, which is more than a glass of milk. All of that calcium comes from the tiny bones, softened by the canning process. Buy the boneless kind and you lose it. The rest of the label is unusual. Around 180 units of vitamin D, close to 50 micrograms of selenium, and a huge dose of vitamin B12\. Those figures come from USDA data. There's also close to a gram of the long-chain omega-3 fats, the ones people buy pills for. Does The Bone Calcium Actually Count Reasonable question. Calcium in a supplement is one thing. A fish skeleton is another. A Norwegian team led by Marian Malde tested this in young healthy men. They compared bone from salmon and cod against a standard calcium supplement. Absorption came out similar. Their trial was published in 2010. Note what that study used though. Salmon and cod bone, not sardine bone. Nobody has run the sardine version, so this is a reasonable read across rather than a direct answer. The Mercury Question This one's easy, and it's good news. Mercury builds up as it moves through the food chain. Big, long-lived predators like swordfish and shark accumulate the most. Sardines are small and short-lived, so they never get the chance. Monitoring by the Food and Drug Administration found average mercury around 0.013 parts per million, against an action level of 1.0. That puts them near the bottom of the table, in the best category of the official American fish advice. Now The Part That Complicates Things You've heard that omega-3 fats protect your heart. The pill trials tell a messier story. The biggest was called VITAL. JoAnn Manson and colleagues gave 25,871 American adults a gram of fish oil daily for over five years. Heart attacks, strokes, cardiovascular deaths, and cancer were the questions. On the main endpoints, the answer was no. Published in 2019 in the New England Journal of Medicine. A British trial called ASCEND tested 15,480 people with diabetes. Same result, no benefit. There's one famous positive trial, and it deserves an asterisk. REDUCE-IT used four grams a day of a purified prescription drug, not fish oil. It cut heart events by a quarter. Researchers still argue about it, partly because the placebo was mineral oil, which appears to have worsened markers in the comparison group. **THE FINDING:** The big fish oil pill trials came back empty. VITAL, with 25,871 people over five years, found no reduction in heart events or cancer. ASCEND, with 15,480 people, found the same. Yet studies that follow people who eat oily fish keep showing lower heart disease rates. Nobody has run a trial on eating sardines specifically, so that gap is not settled. So Why Bother Eating Them Because the fish and the capsule are not the same thing. Studies that track what people eat keep finding lower heart disease rates among those who eat oily fish. Those studies watch people rather than assigning diets, so they can't prove cause. The closest thing to a real trial is old. In 1989, a British team led by Michael Burr advised 2,033 men who had already had a heart attack to eat oily fish twice a week. Deaths over the next two years fell by around 29 percent in that group. Published in the Lancet. Be careful with it though. That was men who were already ill, before modern heart drugs existed, and the trial's own reinfarction measure showed nothing. My honest summary. A tin of sardines is protein, calcium, vitamin D, selenium, and omega-3 fats for a dollar. The heart claim is likelier to hold for the fish than for the pill, and neither is proven. Don't Pour The Oil Down The Sink Here's a practical thing most people get wrong. During canning and storage, omega-3 fats migrate out of the fish and into the packing oil. Drain that oil away and you pour a real share of them down the drain. Recent analyses put the loss at over 20 percent in some cases. So either use the oil, on bread or in a dressing, or buy the ones packed in water and eat everything in the tin. Two Honest Cautions Gout first. Sardines are high in purines, the compounds that break down into uric acid. A 2012 study in the Annals of the Rheumatic Diseases found that people with gout who ate the most purine-rich food had roughly five times the odds of a flare. If you get gout, sardines belong on your avoid list. Then sustainability. Sardine stocks vary enormously by region, and some are in poor shape. Ratings from bodies like Seafood Watch differ by fishery, so no blanket claim holds. Look for a certification label rather than assuming. Three Things Worth Knowing 01Buy Them With The Bones InBoneless and skinless tins throw away the calcium and some of the minerals. The bones are soft enough to mash with a fork, and you won't notice them on toast. 02Use The Oil Or Buy Them In WaterOmega-3 fats leach into the packing oil during storage. Pouring it off costs you some. Tip the whole tin onto your plate, or pick the water-packed ones instead. 03Mind The SaltA tin runs a few hundred milligrams of sodium, and brands vary widely. If you eat them often, check the label and rinse them when the number looks high. Here's What I'd Do This WeekEat one tin this week. Mashed on toast with lemon and pepper is enough.Choose bone-in, not boneless. That's where the calcium hides.Skip the fish oil aisle. The big trials on those pills came back empty.If you have gout, leave these alone. Purines are a real issue here. A dollar tin gives you more calcium than milk, more B12 than almost anything, and a gram of the fats that supplement companies built an industry on. The pills didn't hold up. The fish is still worth eating. Open one this week. Bones and all. **Stay well,**The Healing Plate |
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