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Vitamin B12 for adults 65 and over
Four micrograms a day, the same as any adult. This is the clearest case on the site where the published number is not the problem: an older adult can eat far more than 4 micrograms a day and still become deficient, because the absorption machinery fails before the diet does.
EFSA märkus sellel real:number ei muutu; imendumine sageli muutub
Need on avaldatud rahvastiku võrdlusväärtused, mitte diagnoos ega retsept. Võrdlustarbimine kirjeldab, mis katab terve rühma; see ei saa öelda teie enda staatust ja ükski leht ei saa. Rasedus, krooniline haigus, ravimid ja malabsorptsioon muudavad pilti — viige need küsimused arsti, ämmaemanda, apteekri või dietoloogi juurde.
The absorption problem, step by step
B12 in food is bound to protein. Stomach acid and pepsin have to release it; intrinsic factor made by the stomach lining has to bind it; and a specific receptor in the last part of the small intestine has to absorb the complex. Three steps, each of which can fail with age.
Atrophic gastritis — thinning of the stomach lining, with reduced acid and reduced intrinsic factor — becomes more common with age, and it breaks the first two steps. The result is food-bound B12 malabsorption: the vitamin is on the plate and does not get in. Pernicious anaemia, an autoimmune destruction of the intrinsic factor mechanism, does the same thing more completely.
Which is why free B12 often works when food does not
B12 in a supplement or in a fortified food is not bound to food protein, so it does not need the acid-and-pepsin step. That is the mechanism behind the common recommendation that older adults get part of their B12 from fortified foods or a supplement rather than relying on meat and dairy alone.
Where intrinsic factor itself is the problem, high-dose oral B12 can still work, because a small percentage crosses the gut wall by passive diffusion independently of the receptor. Injections remain the standard route in pernicious anaemia. Both are clinical decisions.
Medicines that make it more likely
Long-term metformin reduces B12 absorption and B12 levels are commonly monitored in people taking it. Long-term proton pump inhibitors and H2 blockers reduce stomach acid and so reduce the release of food-bound B12. Neither is a reason to stop a medicine on the strength of a web page — they are reasons to have B12 checked if symptoms appear.
Why catching it early matters most in this group
B12 deficiency causes a large-cell anaemia and a separate neurological syndrome: numbness and tingling in the feet and hands, unsteadiness, and cognitive and mood changes. In an older person those symptoms are easy to attribute to ageing, and the nerve damage can become permanent if the deficiency runs long enough.
It is also one of the reversible contributors to cognitive symptoms, which is why B12 is a standard test in that assessment. Unexplained tiredness, tingling, unsteadiness or memory change deserve a blood test rather than a supplement bought on a hunch.
Kuidas see võrdub iga teise rühmaga
| Rühm | Võrdlusväärtus | Tüüp | Märkus |
|---|---|---|---|
| Mehed 19–50 | 4 µg | AI | |
| Naised 19–50 | 4 µg | AI | |
| Mehed 51 ja vanemad | 4 µg | AI | |
| Naised 51 ja vanemad | 4 µg | AI | |
| Täiskasvanud 65 ja vanemad | 4 µg | AI | number ei muutu; imendumine sageli muutub |
| Rasedus | 4.5 µg | AI | |
| Imetamine | 5 µg | AI |
Tavaline toit versusthe 4 µgarvtäiskasvanud 65 ja vanemad
Selle nimekirja tipus:Veal liver, 59.9 µg in a 100g portsjon (väike portsjon) — 1 496% of the 4 µgarvtäiskasvanud 65 ja vanemad. Üks portsjon katab kogu päeva üksi.
| Toit | Tavaline portsjon | Portsjoni kohta | Päeva osakaal |
|---|---|---|---|
| Veal liver | väike portsjon, 100 g | 59.9 µg | 1 496% |
| Mackerel | filee, 120 g | 22.8 µg | 570% |
| Canned sockeye salmon | pool purki, 100 g | 5.5 µg | 138% |
| Sardines | pool purki, 60 g | 5.36 µg | 134% |
| Trout | filee, 120 g | 4.93 µg | 123% |
| Salmon | filee, 120 g | 3.66 µg | 92% |
| Liverwurst spread | ühel leivaviilul, 25 g | 3.37 µg | 84% |
| Ground beef | portsjon, 120 g | 3.28 µg | 82% |
| Canned tuna | väike purk, nõrutatud, 100 g | 2.55 µg | 64% |
| Cod | filee, 130 g | 1.36 µg | 34% |
| Greek yogurt | väike pott, 150 g | 1.12 µg | 28% |
| 2% milk | klaas, 200 g | 1.06 µg | 27% |
Portsjonisuurused on tavalised kodused portsjonid, mis on selle tabeli jaoks valitud, mitte ametlikud võrdlusportsjonid, ja lühinimekiri on toimetuslik: igapäevased toidud selles piirkonnas, mitte kõrgeimad 100 g kohta andmebaasis.Toores järjestus 100 g kohta oleks tipus kuivatatud ürtide, joogipulbrite ja rikastatud hommikuhelveste all, mis vastab teisele küsimusele.Koostiseandmed on Ameerika, seega kus USA rikastamistava erineb Euroopa tavast, kannab rida pistoda ja põhjust.Toitaine täieliku järjestuse 100 g kohta avaldab selle saidi toiduandmete jaotis.
Kogu toitaine, mitte ainult see rühm
The B12-vitamiinvõrdlustarbimise leht kannab täielikku vanuse ja soo tabelit, ülemist taset ja seda, mida väärtuse tüüp tähendab.
Seotud lehed
Vitamin D for adults 65 and over
Sama eluetapp, teine toitaine.
Protein for adults 65 and over
Sama eluetapp, teine toitaine.
Allikad:EFSA toitumisalased võrdlusväärtused · Määrus (EL) nr 1169/2011, XIII lisa · USDA FoodData Central SR Legacy (toidukoostis) · EFSA scientific opinion on dietary reference values for cobalamin, vitamin B12 (2015) · Määrus (EL) nr 1169/2011, XIII lisa· kontrollitud2026-09-06
Korduma kippuvad küsimused
How much vitamin B12 do older adults need?
EFSA adequate intake is 4 micrograms a day, the same at every adult age. What changes with age is absorption, not the requirement.
Why do older adults become B12 deficient on a normal diet?
Because releasing B12 from food requires stomach acid and intrinsic factor, and both decline with atrophic gastritis, which becomes commoner with age. Fortified foods and supplements bypass that step.
Should older adults take a B12 supplement?
Guidance commonly suggests getting part of the intake from fortified foods or a supplement rather than food alone, because those forms do not need the acid step. Diagnosis and treatment of an actual deficiency belong with a clinician.
Muuda võrdlusväärtus oma nädalaks
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