Science: Micronutriënttekorten

Most nutrition attention goes to the two ends of the scale: outright deficiency, the scurvy-and-rickets territory a doctor can diagnose, and megadosing, the shelf of high-strength bottles. Most people live in the middle, taking in a little less of several nutrients than they need, year after year, with no symptom to point at. In 2006 the biochemist Bruce Ames proposed that this middle ground still does slow harm over a lifetime.

What Inadequacy Means

A deficiency is a shortfall large enough to cause a clinical problem a doctor can diagnose. Too little vitamin C and gums bleed. Too little vitamin D in a child and bones soften. Inadequacy sits above that: an intake below the amount set as sufficient for the population, mild enough that nothing shows up day to day. Nutrition scientists size it with the estimated average requirement, or EAR: the daily intake that meets the needs of 50% of healthy people in an age and sex group. Counting how many people fall below the EAR is the standard way to measure a shortfall. It measures reported intake against a benchmark; it does not measure the level in your blood.

The Triage Theory

Ames's reasoning is evolutionary. For most of human history, shortages of vitamins and minerals came and went. So a scarce nutrient is used first for reaching reproductive age, and less is left for repairs that pay off only in old age. When a micronutrient runs short, the proteins and enzymes that depend on it for immediate survival keep their supply. The ones that handle slow maintenance (repairing DNA, clearing damaged mitochondria, keeping arteries and bone in order) lose theirs first.

Each shortfall causes damage that no test picks up as a deficiency. The damage can show up decades later as higher risk of cancer, heart disease and other diseases of aging. In a 2018 follow-up, Ames sorted nutrient-dependent proteins into survival proteins and longevity proteins. He named a set of candidate "longevity vitamins" whose supply drops the same way when intake is low. That framework rests on mechanism and evolution. It has not been tested as a chain of cause and effect in people.

The Evidence For Triage

The hierarchy has been traced in two nutrients, both in reviews by Joyce McCann and Ames. Vitamin K is the clearer case. It activates a family of proteins that need a chemical step called carboxylation, the Gla proteins. Some are clotting factors, and clotting is a survival function: bleed out and you do not reproduce. Others do slow maintenance work. Matrix Gla protein helps keep calcium out of artery walls, and osteocalcin builds bone. McCann and Ames argued that when vitamin K runs modestly short, the clotting proteins get carboxylated first while the maintenance proteins go undercarboxylated. That matches the observation that low vitamin K tracks with artery and kidney calcification and with fragile bone.

Selenium gave a second test. Humans make 25 selenoproteins, and if triage is real they should not all fail together when selenium runs low. McCann and Ames classified them and found a hierarchy. About five selenoproteins tied to short-term survival held their function on low selenium, while the seven or so tied to long-term protection lost theirs first. The same aging diseases that track with a modest selenium shortfall also track with genetic faults in those long-term selenoproteins. The ranking comes from cell and animal work and from disease associations; no human trial has tested it. Still, this is exactly what triage predicts, and the selenium data matched it.

How Common Shortfalls Are

Modest shortfalls of several nutrients are widespread, the best-supported piece of the theory. Using US national intake data (NHANES), researchers compared what people actually eat against the EAR for 19 micronutrients. A handful were rarely short: fewer than 8% fell below the requirement for folate, zinc, the B vitamins, iron and selenium once fortified foods were counted.

Several others were short in a large share of the population: vitamin D and vitamin E at the top, then magnesium, calcium, vitamin A and vitamin C. Only about a third of people reached the adequate-intake mark for vitamin K, and potassium was reached by almost nobody. Choline, absent from that count, falls short for most adults in other national analyses. These figures come from diet recalls that people report imperfectly, so the exact percentages carry error. The shortfalls cluster in nutrients that ordinary whole foods supply. Ultra-processed foods now supply about 58% of calories in the average US diet, and they are lower in magnesium, potassium and vitamin E than the whole foods they displace.

Does A Multivitamin Fix It

The common conclusion is that everyone should take a multivitamin. Large randomized trials test that step directly, and carry more weight than intake surveys. A systematic review for the US Preventive Services Task Force pooled dozens of trials and found the evidence insufficient to say multivitamins prevent cardiovascular disease or cancer. It recommended against beta-carotene and vitamin E for that purpose outright. A cohort that followed 390,124 US adults for up to two decades found no lower mortality among daily users. If anything the rate ran slightly higher early on, the sign of sick people starting supplements when their health is already failing.

Followed for up to twenty years, daily multivitamin users lived no longer than non-users: if anything they died slightly sooner early on.

The signals that do exist are modest. In the Physicians' Health Study II, a trial in 14,641 male doctors, a daily multivitamin lowered total cancer by about 8% over roughly 11 years. The drop was small in absolute terms, with no effect on cancer deaths, and the same trial found no reduction in cardiovascular events. In a separate three-year trial, older adults on a multivitamin scored a little better on cognitive tests than those on placebo. Some companion analyses have not reproduced that result, and it is still argued over.

The Research & Studies

Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.

Measurement And Diagnosis

70% below the EAR for vitamin D, 60% for vitamin E, 45% for magnesium in US intake dataEstablished

In plain terms

In a national US survey, most adults took in less vitamin D and vitamin E than the average requirement, and nearly half fell short on magnesium.

In detail

Fulgoni and colleagues (J Nutr 2011) applied the National Cancer Institute method to NHANES 2003-2006 (n=16,110, ages 2 and older) to compare usual intakes with the Dietary Reference Intakes. From all sources combined (food, fortification and supplements), the share below the estimated average requirement was 70% for vitamin D, 60% for vitamin E, 45% for magnesium, 38% for calcium, 34% for vitamin A and 25% for vitamin C, while fewer than 8% were short on folate, zinc, iron and the B vitamins. Only about 35% exceeded the adequate intake for vitamin K and almost none for potassium.

The study · 1

Fulgoni 2011, J Nutr · J Nutr

Longevity And Mortality

Evidence insufficient that multivitamins prevent cardiovascular disease or cancerEstablished

In plain terms

Pooling many trials, a US expert review found no clear evidence that a daily multivitamin prevents heart disease or cancer in healthy adults.

In detail

The US Preventive Services Task Force evidence review (O'Connor 2022, JAMA) searched trials through February 2022 and synthesized 84 studies. It concluded that the evidence is insufficient to assess whether multivitamin supplementation prevents cardiovascular disease or cancer in generally healthy, non-deficient adults, and recommended against beta-carotene and vitamin E for that purpose because trials showed no benefit and beta-carotene raised lung-cancer risk in smokers. The review addresses primary prevention in well-nourished adults, not treatment of a diagnosed deficiency.

The study · 1

O'Connor 2022, JAMA (USPSTF evidence review) · JAMA

No lower mortality among daily multivitamin users across 390,000 US adultsEstablished

In plain terms

Following nearly 400,000 adults for up to two decades, people who took a daily multivitamin were no less likely to die than people who did not.

In detail

Loftfield and colleagues (JAMA Network Open 2024) pooled three prospective US cohorts (390,124 adults, 164,762 deaths, up to 27 years of follow-up). Daily multivitamin use was not associated with lower all-cause mortality; in the earliest follow-up window users had a slightly higher hazard (multivariable hazard ratio near 1.04), consistent with people beginning supplements as their health declines.

The study · 1

Loftfield 2024, JAMA Netw Open · JAMA Netw Open

Nutrient-dependent proteins sorted into survival proteins and long-term longevity proteinsEmerging

In plain terms

A follow-up idea sorts nutrient-dependent proteins into ones the body needs to survive now and ones that protect long-term health, and says a shortfall sacrifices the second group first.

In detail

In a 2018 PNAS perspective Ames extended the triage theory by classifying proteins into survival proteins versus longevity proteins, arguing that a modest deficiency of a nutrient cofactor triggers a rationing mechanism that favors survival proteins while sacrificing longevity proteins, whose impairment insidiously raises the risk of age-related disease. He named candidate longevity vitamins (including ergothioneine, PQQ, queuine and several carotenoids). It is a conceptual classification and review, not an outcome study.

Who this may not transfer to:A conceptual classification and literature review, not a measurement taken in people.

The study · 1

Ames 2018, PNAS · Proc Natl Acad Sci USA

Cancer Risk And Outcome

Daily multivitamin lowered total cancer about 8% in male physicians, with no drop in cancer deathsEstablished

In plain terms

In a large trial of male doctors, taking a daily multivitamin for about 11 years modestly lowered the chance of getting cancer, though it did not lower the chance of dying from cancer.

In detail

The Physicians' Health Study II (Gaziano 2012, JAMA) randomized 14,641 male US physicians aged 50 and older to a daily multivitamin or placebo, median follow-up 11.2 years. Daily multivitamin use modestly but significantly reduced total cancer (hazard ratio 0.92, an 8% relative reduction) versus placebo. There was no significant effect on cancer mortality or on site-specific cancers such as prostate. The population was well-nourished male physicians, which limits how far the result extends.

Who this may not transfer to:Measured entirely in male US physicians. It has not been tested in women, and a companion women's trial did not exist here, so the effect in women is unknown, neither assumed larger nor smaller.

The study · 1

Gaziano 2012, JAMA (PHS II) · JAMA

Heart And Vascular

Daily multivitamin did not reduce cardiovascular events in male physiciansEstablished

In plain terms

In the same large trial of male doctors, a daily multivitamin did not lower heart attacks, strokes or cardiovascular death.

In detail

The cardiovascular arm of the Physicians' Health Study II (Sesso 2012, JAMA) followed the same 14,641 male physicians for a median 11.2 years. Daily multivitamin use had no effect on major cardiovascular events (hazard ratio 1.01), nor on myocardial infarction, stroke or cardiovascular mortality individually. This was the first long-term randomized trial of a common multivitamin for cardiovascular prevention.

Who this may not transfer to:Measured entirely in male US physicians. The cardiovascular null has not been tested against a women's cohort here, so it is not assumed to transfer either way.

The study · 1

Sesso 2012, JAMA (PHS II) · JAMA

How it works

Triage theory: the body rations a scarce nutrient toward survival, starving long-term repairEmerging

In plain terms

The theory says that when a vitamin or mineral runs short, the body protects the jobs it needs to survive right now and skimps on the slow upkeep that guards against disease decades later.

In detail

Ames proposed in PNAS (2006) that episodic micronutrient shortages during evolution favored a rationing response: when a nutrient is scarce, functions needed for short-term survival and reproduction are prioritized over functions needed only for long-term health, in part by adjusting the binding affinity of nutrient-dependent proteins. The predicted consequence is insidious accumulation of DNA damage and mitochondrial decay that accelerates cancer, aging and neural decline without producing an overt deficiency. It is presented as a hypothesis supported by mechanistic strands, not a demonstrated cause-and-effect chain in people.

Who this may not transfer to:A mechanistic and evolutionary hypothesis, not a measurement taken in people.

The study · 1

Ames 2006, PNAS · Proc Natl Acad Sci USA

Vitamin K triage: clotting Gla proteins hold their supply while artery and bone Gla proteins lose theirsEmerging

In plain terms

When vitamin K is a little short, the clotting proteins that keep you alive get supplied first, and the proteins that keep calcium out of arteries and bone strong get shorted.

In detail

McCann and Ames (Am J Clin Nutr 2009) reviewed vitamin K as a worked example of triage. Vitamin K is a cofactor for gamma-carboxylation of Gla proteins; clotting factors (a survival function) are prioritized, while maintenance Gla proteins such as matrix Gla protein (which inhibits arterial calcification) and osteocalcin go undercarboxylated first under modest inadequacy. They linked this pattern to observational associations between low vitamin K status and arterial and kidney calcification, bone fragility and cardiovascular disease.

Who this may not transfer to:A mechanistic review of protein carboxylation hierarchy, not an intervention measured in people.

The study · 1

McCann & Ames 2009, Am J Clin Nutr · Am J Clin Nutr

Selenoprotein hierarchy: survival selenoproteins prioritized over long-term ones under low seleniumEmerging

In plain terms

The selenium-dependent proteins are not all supplied equally; the ones tied to survival hold up when selenium is low while the ones tied to long-term protection fail first.

In detail

McCann and Ames (FASEB J 2011) classified human selenoproteins by essentiality and reported a hierarchy consistent with triage: roughly five selenoproteins tied to short-term survival (for example Gpx4, Txnrd1) retained function under modest selenium deficiency, while about seven tied to long-term protection (for example Gpx1) lost function first. The same age-related conditions (cancer, heart disease, immune dysfunction) prospectively associated with modest selenium shortfall also track with genetic dysfunction of the non-essential selenoproteins.

Who this may not transfer to:A classification of selenoprotein hierarchy from cell, animal and association data, not an intervention measured in people.

The study · 1

McCann & Ames 2011, FASEB J · FASEB J

Cognition

Multivitamin modestly improved cognition over three years in older adultsEmerging

In plain terms

In a three-year trial, older adults taking a daily multivitamin scored a little better on cognitive tests than those taking a placebo.

In detail

COSMOS-Mind (Baker 2023, Alzheimer's & Dementia), a sub-study of the COSMOS trial, randomized older adults to a daily multivitamin-mineral, cocoa extract, both or placebo and assessed cognition by telephone over three years. The multivitamin arm improved global cognition versus placebo, with the authors estimating a benefit roughly equivalent to slowing cognitive aging by about 1.8 years; cocoa extract showed no cognitive effect. Some companion analyses using different cognitive batteries have not reproduced the size of the effect, so it remains debated.

The study · 1

Baker 2023, Alzheimers Dement (COSMOS-Mind) · Alzheimers Dement

What The Evidence Points To

The common shortfalls are real, and the triage hierarchy has held where tested. No trial shows that pills for a mild shortfall make a person live longer or better. Eat whole food first, and correct the specific nutrients you lack. Most of the commonly short nutrients come cheaply from food:

• Magnesium: nuts, seeds, legumes, whole grains and leafy greens.
• Vitamin K: leafy greens, and as K2, fermented foods and animal fat.
• Omega-3: oily fish such as salmon and sardines.
• Choline: eggs and liver; selenium: a couple of Brazil nuts.
• Calcium: dairy, tinned fish with bones and fortified plant milks.
• Vitamin D is the exception: food alone rarely supplies enough, so it sits at the top of the shortfall list. Sunlight and, in dark months, a modest supplement are the usual routes.
• Direct-to-consumer lab panels measure vitamin D, ferritin, magnesium and B12 without a referral. A real shortfall is worth correcting.

Go Deeper

Each of these nutrients has its own page, graded on its own evidence:

• Vitamin D and magnesium, the two widest shortfalls, and vitamin K2, the triage theory's clearest worked example.
• Omega-3 fish oil for a nutrient most people under-eat, and whole foods, the dietary pattern that covers most shortfalls at once.
• The multivitamin, weighed on its own trial evidence, and the biology of aging, where the long-term-damage side of this theory connects to the wider picture.

Common Questions

Does inadequacy make you feel tired or run down?

Not reliably. That is the trap: there is nothing to point to. A modest shortfall produces no day-to-day change, so fatigue or low mood cannot tell you which nutrient, if any, is short. By the triage theory, the damage runs for years with nothing to feel, which is the idea's central claim. If you feel unwell, get checked; do not assume a vitamin gap.

Is the triage theory proven?

No. What would settle it is a specific trial: take healthy people with a mild shortfall and correct it. Then follow them for decades to see whether cancer, heart disease or lifespan actually shift. That trial would need to isolate a single nutrient at a modest dose and run long enough for slow damage to surface. Nobody has mounted a study on that scale.

Do fortified foods already cover this?

Partly. Fortification is the reason some nutrients are rarely short while others still are. Grains and cereals were fortified with folate, iron and B vitamins decades ago, so those rank low. No such program reaches magnesium, vitamin D or vitamin E, which keeps them near the top of the shortfall list.

Who actually benefits from a multivitamin?

A multivitamin earns its place when there is a gap to fill. That means a restricted or low-calorie diet, pregnancy, an older adult who eats little, or a diagnosed low level of a specific nutrient. Outside those cases, correcting the one nutrient you actually lack, from the foods that carry it, does the same job.