What Foods Contain Nickel: High and Low Sources

Foods of plant origin, particularly nuts, legumes, whole grains, chocolate, and certain dried fruits, contain the highest concentrations of nickel, while animal-based foods like meat, poultry, eggs, and dairy are consistently among the lowest sources.1PubMed Central. Nickel Most people take in somewhere between 100 and 300 micrograms of nickel a day through food, though that number can swing below 70 or above 900 depending on diet and geography. For the majority of the population, this is harmless. But for the estimated 8–15 percent of people sensitized to nickel, knowing where it hides in food and how cooking and preparation change exposure can make a real difference in daily symptoms.

The High-Nickel Foods

The broadest pattern is simple: plants accumulate nickel from soil, so the more concentrated and less processed a plant food is, the more nickel it tends to carry. The foods that consistently rank highest include:

  • Nuts and seeds: Cashews, almonds, peanuts, hazelnuts, and sunflower seeds are routinely among the richest dietary sources of nickel.
  • Legumes: Lentils, soybeans, chickpeas, kidney beans, and peas. Soy products like tofu and soy milk also carry elevated levels.
  • Whole grains: Oats, buckwheat, whole wheat, millet, and bran cereals. Whole-grain flours retain more nickel than refined white flour because the outer layers of the grain, where minerals concentrate, are preserved during milling.2Springer Link. Grains, whole flour, white flour, and some final goods: an elemental comparison
  • Chocolate and cocoa: Dark chocolate in particular can be a surprisingly potent source, with cocoa beans being a high-accumulator crop.
  • Certain vegetables: Spinach, kale, asparagus, and canned tomatoes tend to be higher than other vegetables. Fresh tomatoes are moderate, but the picture changes when they are cooked in stainless steel, as discussed below.
  • Dried fruits: Dates, figs, prunes, and dried apricots carry more nickel per serving than their fresh counterparts, in part because drying concentrates the mineral content.

Tea, particularly brewed from loose leaves, and coffee are also meaningful contributors to daily nickel intake for heavy drinkers, though single servings tend to be modest. Canned foods sometimes get flagged as a concern, but a Belgian market study found that storage in cans did not significantly increase the nickel content of foods, indicating that leaching from packaging materials is not a major contributor.3PubMed. Nickel in foods sampled on the Belgian market: identification of potential contamination sources

The Low-Nickel Foods

If you are trying to reduce your nickel intake, the safest territory is animal-based protein and a handful of plant foods that happen to be low accumulators. Careful selection of foods with relatively low nickel concentration can meaningfully reduce total daily intake.4PubMed Central. Low nickel diet in dermatology The foods generally considered safe for a low-nickel diet include:

  • Meat and poultry: Beef, chicken, turkey, and pork are all low in nickel. Fresh, unprocessed cuts are preferable to processed versions that may contain soy-based fillers or additives.
  • Eggs: A reliable low-nickel protein source.
  • Dairy: Milk, cheese, butter, and yogurt are consistently low.
  • White rice: Unlike brown rice, which retains its bran layer, polished white rice has less nickel.
  • Refined wheat products: White bread and regular pasta made from refined flour tend to be lower than their whole-grain equivalents.
  • Select fruits: Bananas, apples, pears, and citrus fruits are generally on the lower end. Berries vary but are usually moderate to low.
  • Select vegetables: Potatoes (peeled), carrots, cucumber, zucchini, bell peppers, and celery tend to be lower in nickel than leafy greens.

The trade-off is obvious: many of the highest-nickel foods are nutritionally dense. Whole grains, legumes, and nuts are staples of heart-healthy diets. Nobody should restrict them without a clinical reason. For people who do need to limit nickel, the goal is strategic swapping rather than blanket avoidance: white rice instead of oats, chicken instead of lentils, refined bread instead of multigrain.

Why Nickel Content Varies So Much

Published lists of high- and low-nickel foods are useful starting points, but they are estimates, not guarantees. The nickel content of the same crop can differ substantially depending on where and how it was grown. Soil is the primary variable: nickel is a naturally occurring element in earth’s crust, and its concentration in topsoil varies by region, geology, and land-use history. Research has found positive correlations between the nickel available in soil and the nickel that ends up in crops, though the relationship also depends on soil characteristics like acidity and texture, and it differs from one crop to another.5Soil Use and Management. Influence of soil properties on Ni accumulation in food crops and corresponding dietary health risk with a typical Chinese diet

Irrigation water is another factor. In regions where agricultural fields are irrigated with industrial or municipal wastewater that has not been properly treated, nickel concentrations in the water and subsequently in the crops can be significantly elevated.6Arabian Journal of Chemistry. Evaluation of nickel toxicity and potential health implications of agriculturally diversely irrigated wheat crop varieties This is more of a concern in parts of South and Central Asia, the Middle East, and sub-Saharan Africa than in Western Europe or North America, where wastewater treatment standards tend to be stricter. But even within a single country, differences in local geology and agricultural practice mean that the same food bought from two different regions can carry meaningfully different nickel loads.

This variability is why you will see different nickel values for the same food in different published databases. A table of nickel content from a Scandinavian study may not match one from an Indian or Chinese study, and neither is wrong. They reflect different soils, different cultivars, and different growing conditions. The general ranking of food categories (nuts and legumes high, meat and dairy low) holds up consistently, but the exact microgram-per-serving numbers should be read as ballpark figures.

Stainless Steel Cookware as a Hidden Source

One source of dietary nickel that catches people off guard is their own pots and pans. Stainless steel is an alloy that typically contains around 8–10 percent nickel, and it can leach that nickel into food during cooking. The effect is especially pronounced with acidic foods and long cooking times. A study that simmered tomato sauce in stainless steel for six hours found nickel concentrations in the sauce increased up to 26-fold compared to sauce cooked without stainless steel, with even higher increases at longer durations.7PubMed Central. Stainless Steel Leaches Nickel and Chromium into Foods During Cooking That is a dramatic number, and it applies specifically to the combination of high acidity (tomato, vinegar, lemon-based sauces), extended contact time, and certain grades of stainless steel.

Broader testing of different cookware materials has confirmed that acidic foods cause more metal leaching in general, and that stainless steel is a notable contributor of nickel specifically.8PubMed Central. Assessing Leaching of Potentially Hazardous Elements from Cookware during Cooking: A Serious Public Health Concern For most people this is not a health issue, but for someone managing a nickel allergy, it can quietly undermine an otherwise careful diet. Practical takeaways: if you are nickel-sensitive, consider using glass, ceramic, or enamel-coated cookware for acidic dishes. Quick sautés in stainless steel are far less of a concern than long simmers, so the length of time food sits in the pan matters.

What About Drinking Water?

Nickel can appear in tap water, primarily from corrosion of nickel-containing plumbing fixtures and fittings rather than from the water source itself. Concentrations tend to be highest in “first-draw” water, meaning the water that has been sitting in pipes overnight or for several hours. The European Food Safety Authority assessed this scenario and concluded that drinking a glass of water on an empty stomach does not raise a health concern at typical exposure levels.9EFSA Journal. Update of the risk assessment of nickel in food and drinking water That said, people with severe nickel sensitivity sometimes report symptom flares from first-draw water. The simple workaround is to let the tap run for 30 seconds to a minute before using water for drinking or cooking, which flushes out the stagnant water that has had the most contact time with pipes.

Who Actually Needs to Worry About Dietary Nickel

For the general population, dietary nickel at typical levels is not considered a health risk. The people for whom it matters are those with a confirmed nickel allergy, which is one of the most common contact allergies worldwide. Nickel allergy is usually diagnosed after skin reactions to jewelry, belt buckles, or other metal objects. What is less widely appreciated is that some nickel-allergic individuals also react to nickel consumed in food, a condition sometimes called systemic nickel allergy syndrome. In sensitized people, ingested nickel can trigger gastrointestinal symptoms that look a lot like irritable bowel syndrome, along with skin flares at previous sites of contact dermatitis.10PubMed Central. Irritable Bowel Syndrome and Nickel Allergy: What Is the Role of the Low Nickel Diet?

The overlap between systemic nickel allergy and IBS is under-recognized. A case report described a woman with known skin-based nickel allergy who had been diagnosed with nonresponding IBS. Her gastrointestinal and extra-intestinal symptoms either resolved or became manageable after she started a low-nickel diet.11PubMed. Nickel Allergy Masquerading as Irritable Bowel Syndrome: Case Report This does not mean that everyone with IBS should try a low-nickel diet. It means that if you have a known nickel allergy and also have chronic, unexplained gut symptoms, it is worth discussing the possibility with a dermatologist or allergist.

The mechanism involves the immune system’s memory: once you are sensitized to nickel through skin contact, your immune system creates memory T cells specific to nickel. When nickel is later encountered internally through food, those same T cells can become activated and cause inflammation, both in the skin and in the gut.12American Journal of Medicine Open. Review Systemic Nickel Allergy Syndrome The dose matters: in a controlled challenge study, all nickel-sensitive patients given 3.0 mg of nickel orally experienced flare-up reactions at previous patch test sites, while none of the patients given a placebo reacted.13PubMed. Flare-up reactions after oral challenge with nickel in relation to challenge dose and intensity and time of previous patch test reactions The average diet delivers less than that (typically 0.1 to 0.3 mg per day), but a meal heavy in high-nickel foods can push the total higher, and individual thresholds vary.

How Iron Status Affects Nickel Absorption

One factor that gets overlooked in discussions of dietary nickel is that not everyone absorbs it equally. Your iron status plays a significant role. When the body is low on iron, a transport protein in the gut lining gets upregulated to grab as much iron as possible from incoming food. The problem is that this same transporter is not very selective, and it readily binds and transports other similarly-charged metals, including nickel. People with iron deficiency therefore tend to retain more nickel from the same diet than people with adequate iron stores.14Journal of Community Medicine & Public Health. Systemic Nickel Allergy Syndrome (SNAS): Taking Stock of Medical Nutrition Therapy SNAS and Nutrition Animal research has confirmed this mechanism, showing that iron-deficient rats absorb nickel through the same active transfer system that the intestinal lining uses for iron.15Acta Pharmacologica et Toxicologica. Enhanced intestinal nickel absorption in iron-deficient rats

The flip side is encouraging: adequate iron intake downregulates this transporter, effectively closing one of the main doorways nickel uses to get into the bloodstream. This is especially relevant for premenopausal women, vegetarians, and others at higher risk of iron deficiency, who may be unknowingly absorbing more nickel than average. If you have a nickel allergy and low iron, correcting the iron deficiency may improve your nickel-related symptoms even without major changes to what you eat.

Vitamin C factors in here too. Because vitamin C enhances iron absorption, taking it with meals can help iron occupy those gut transporters first, leaving less room for nickel. The American Academy of Dermatology has suggested supplemental vitamin C at meals as a strategy for nickel-sensitive patients, with some studies reporting a measurable decrease in nickel levels in the blood afterward.16Journal of Community Medicine & Public Health. Systemic Nickel Allergy Syndrome (SNAS): Taking Stock of Medical Nutrition Therapy SNAS and Nutrition – Section: Possible Solutions This is not a cure, but as a low-risk adjunct to a low-nickel diet, it is worth knowing about.

Practical Approaches to a Low-Nickel Diet

If you and your doctor decide a low-nickel diet is worth trying, the goal is not perfection. Nickel is in virtually all foods, so you cannot eliminate it entirely. The aim is to reduce total daily exposure enough to stay below your symptom threshold. A point-based scoring system has been developed to simplify this, assigning values to foods based on their typical nickel content so patients can track their daily intake without memorizing long lists.17PubMed. Low-nickel diet scoring system for systemic nickel allergy

Some general strategies that come up repeatedly in clinical guidance:

  • Swap whole grains for refined: White rice instead of brown, white bread instead of whole wheat, regular pasta instead of whole-grain. You lose some fiber and micronutrients, so compensate elsewhere.
  • Replace legumes with animal protein: Chicken, fish, eggs, and dairy deliver protein without the nickel load of lentils, beans, and soy.
  • Limit chocolate and cocoa: This is one of the harder changes for many people but also one of the most impactful, since chocolate is dense in nickel per serving.
  • Be strategic with vegetables: Potatoes, carrots, peppers, and squash are generally lower than spinach, kale, and asparagus. You can still eat leafy greens, just in smaller portions.
  • Avoid cooking acidic foods in stainless steel: Use ceramic, glass, or enamel-coated pots for tomato sauces, citrus-based dishes, and anything vinegar-heavy.
  • Flush the tap: Run your cold water for a brief period before filling a glass or cooking pot, especially in the morning.
  • Consider vitamin C with meals: It can reduce how much nickel your gut absorbs, particularly if your iron status is not optimal.

Studies testing low-nickel diets in clinical settings have reported improvements in both skin and gastrointestinal symptoms, though much of the evidence is from small trials. One study found that hand eczema cleared completely in about 90 percent of patients on a combined treatment that included a low-nickel diet, compared to just one out of ten in the control group.18PubMed. Disulfiram and low nickel diet in the management of hand eczema: a clinical study That trial combined the diet with a medication (disulfiram, a nickel-chelating agent), so the diet’s independent contribution is hard to isolate. Still, the direction of the evidence is consistent: reducing dietary nickel helps some sensitized people, and the approach carries no obvious nutritional downside as long as you replace the restricted foods thoughtfully.

Common Misconceptions About Nickel in Food

A few misunderstandings come up repeatedly when people start researching this topic. The first is that canned food is automatically high in nickel due to metal leaching from the can itself. As noted earlier, the evidence does not support this. Nickel levels in canned food are driven by what is inside the can, not the can’s metal. If the food item is inherently high in nickel, such as canned beans or lentils, the nickel content will be high regardless of the container.

A second misconception is that “organic” produce will be lower in nickel. Nickel is a naturally occurring soil element, not a pesticide or agricultural additive. Organic farming practices do not specifically address soil nickel levels, so organic spinach or organic oats are not inherently lower in nickel than conventionally grown versions. The soil they grow in is what matters, and organic soil can be just as nickel-rich as conventional soil.

A third is that stainless steel is always a major nickel source. The 26-fold increase from the tomato sauce study sounds alarming, but that was after six hours of simmering a highly acidic food. Boiling water for pasta in stainless steel, or quickly frying vegetables, adds very little nickel. The risk scales steeply with acidity and time, so the cookware concern is narrow and specific rather than blanket.

Finally, some people assume that if they are allergic to nickel on their skin (from jewelry, for example), they must also react to nickel in food. That is not always the case. Systemic nickel allergy syndrome is a real condition, but not every person with contact dermatitis from a nickel earring will flare from eating a handful of cashews. The relationship depends on the degree of sensitization, the dose of nickel consumed, and individual immune variability. Patch testing and, in some cases, controlled oral nickel challenges help clarify whether dietary nickel is actually driving symptoms for a given person.