Lunch is a brown rice bowl with seared tuna. The morning shake is plant protein with a spoon of cacao and a shake of cinnamon, and a handful of almonds covers the afternoon. On paper it's the healthiest day of eating you've had all month, and a few of those foods carry something you'd rather leave out.
The word toxic came from war. The Greek toxikon was poison for smearing on arrows, named after toxon, the bow. Today it gets fired at almost everything in the kitchen.
Online, the lists of scary ingredients run long, and most of what's on them is noise. The real contaminants are fewer than the lists suggest, and they gather in places that rarely get checked: the foods bought precisely because they're good for you. Look down the list below and notice what's missing from it. A fresh steak, a lamb chop and a couple of eggs barely feature at all.
The amount decides
A trace of almost anything turns up somewhere if you test hard enough. What matters is how much, how often, and who's eating it. Something you eat once a month barely registers. A food you have every day, in a large serving, is where a small contaminant becomes a real one.
Children and pregnant women sit at the sharp end, because a developing brain takes lead and mercury much harder than an adult one. Fruit juice for small children is a good example. When Consumer Reports tested 45 popular apple, grape, pear and blended juices, 21 of them had worrying levels of cadmium, inorganic arsenic or lead, and seven could harm a child drinking half a cup a day. Water makes the better daily drink.
Baby food had its own reckoning. In 2021, a US Congress investigation obtained the internal test results of four of the largest American baby food makers, organic brands among them, and found arsenic, lead and cadmium in the foods of every one. One company had used an ingredient high in arsenic to improve its products' "crumb softness". Since January 2025, the US limit for lead has been 10 parts per billion in most baby foods, and 20 in single-ingredient root vegetables and dry infant cereals. Food you cook yourself, with meat, fish and egg in it, puts the choice back in your hands.
So the useful question is a simple one. Which of the foods you eat most often carry something worth reducing, and what's the easiest way to reduce it?
Rice and arsenic
Arsenic has a long criminal record. By the nineteenth century it was known as "inheritance powder", because impatient heirs were known or suspected to use it, and its symptoms looked enough like cholera to slip past unnoticed. Today it reaches most plates by a duller route.
Rice pulls arsenic out of the soil and water it grows in more readily than other grains, and most of it sits in the outer layers. That's why brown rice, the healthier choice on most other counts, usually carries more than white. Rice cakes concentrate it further, and rice drinks are unsuitable for children under five for this reason. Babies take in the most for their size, so rotate infant cereals between oat, barley and multigrain, with rice as one of several, and keep rice snacks for toddlers as an occasional thing. Hijiki, a black seaweed sold dried, holds even more arsenic than rice and is one to skip altogether.
Where it grew matters too. White basmati from California, India or Pakistan has about half the arsenic of most other rice, and brown basmati from those places about a third less than other brown rice. In the US, rice from Arkansas, Louisiana or Texas carries the most, and white rice from California about 38 percent less than white rice from elsewhere. Organic rice takes up arsenic the same way conventional rice does, so the label is no help here.
The fix is in the pan. Bring the rice to the boil in plenty of water, cook it for five minutes, pour that water away, then add fresh water and finish cooking it the usual way until the water's absorbed. That change strips out about half the arsenic from brown rice and around three-quarters from white, and keeps most of the minerals. Then give rice a rest across the week. Barley, buckwheat and millet carry far less, and a plate of meat, fish or eggs needs no grain at all.
Big fish and mercury
"Mad as a hatter" comes from felt hat makers, poisoned by the mercury vapour they worked with, and the brain is still where mercury does its damage. China's first emperor may have been killed by his cure for death. One theory holds that the elixir of immortality his court prepared for him contained mercury, and his tomb is said to hold rivers of it. It builds up as it moves along the food chain. A small fish picks up a little from the water, a bigger fish eats hundreds of small ones and keeps their mercury, and the biggest hunters in the sea end up carrying the most. Swordfish, shark, king mackerel and bigeye tuna sit at the top.
The fish that carry the least are the small, oily ones, and they're also the best source of the omega-3 fats that make fish worth eating. Sardines, salmon, anchovies, herring and trout are all low, and the simplest way to eat from the bottom of the chain is a tin of . Canned light tuna has less than albacore, and tuna steaks sit higher still.
Salmon comes with one footnote. When farmed and wild salmon from around the world were tested side by side in 2004, the farmed fish carried more PCBs and dioxins, and the European farms the most. Levels in Norwegian farmed salmon have fallen since, and a 2017 comparison in Norway found them lower than in wild Atlantic salmon. The wild fish still had more omega-3, selenium and zinc, and the farmed fish far more omega-6 fat, so the case for wild salmon now rests on what it brings more than on what it avoids. Eat fish, eat it often, and choose from the small end of the food chain, especially during pregnancy and for young children.
Protein powder and lead
Protein powders concentrate whatever was in the crop they came from, and plants pull lead out of the soil. When Consumer Reports tested bestselling powders and shakes, the plant-based ones carried on average nine times as much lead as those made from dairy, and twice as much as those made from beef. Half of the dairy powders still had more than its experts would want in a daily scoop.
A diet with meat, fish and eggs in it rarely needs a powder at all, so a daily scoop is mostly an expense with little to show for it. If you do use one every day, whey or another dairy protein is usually the cleaner choice, and a brand that publishes its heavy metal results for each batch tells you more than one that just says "tested".
Cacao and spices
Cacao plants take up cadmium from the soil, and the beans pick up lead from dust while they dry in the sun after harvest. Dark chocolate tends to carry more of both than milk chocolate, probably because it holds more cacao. A square of dark chocolate is a treat. Two tablespoons of raw cacao powder in a smoothie every morning is a different amount altogether.
Cinnamon had its own scandal. In 2023, apple cinnamon fruit pouches made for small children were found to be laced with lead. The cinnamon came from Ecuador, and the worst sample held more than 2,000 times the lead limit then being considered for bark spices. The culprit turned out to be lead chromate, an industrial yellow pigment, most likely added to bulk up the spice and make it sell for more. By March 2024, health officials had counted 519 cases across 44 US states. Several brands of ground cinnamon were later flagged for lead as well.
Turmeric has the same problem. Lead chromate has been added to turmeric across South Asia to brighten its colour and fetch a better price, and in a recent check of four countries that grow most of the world's supply, 14 percent of samples carried more than 2 micrograms of lead per gram, and samples from three cities came in above 1,000. That matters most if you take turmeric every day, in golden milk or capsules. For turmeric, buy from established brands, and treat cheap, unusually vivid loose powder of unknown origin with suspicion.
Everyday dried herbs carry some of this too. When Consumer Reports tested 126 dried herbs and spices, about a third had worrying combined levels of lead, cadmium and arsenic, and every thyme and oregano product was among them. Neither the brand nor an organic label predicted which. Black pepper, garlic powder and coriander came out among the lowest, and thyme or oregano grown and dried at home sidesteps the question.
Charred and cured meat
Processed meat is the one place on this list where the meat itself is the issue, and it deserves a straight answer. Bacon, ham and salami share a group with tobacco, as a known cause of bowel cancer. That group describes how sure the link is, though, not how big it is. Every 50 grams eaten daily raises your own risk by about 18 percent, and that's 18 percent of a small number.
The Everyday Food Scare That Turned Out to Be a Myth sizes it fully. Swap the cured kind for fresh meat, fish and eggs, and keep it for occasions.
Fresh meat has one issue, and it's about the cooking. When meat chars over a grill or in a scorching pan, the blackened parts form compounds that damage DNA. You can cut most of them without giving up the barbecue.
Marinate the meat first. In one test of grilled beef steaks, an hour in an oil-and-vinegar marinade with herbs and spices cut those compounds by 57 to 88 percent, depending on the mix. Turn it often so it never blackens, and trim off the burnt bits before you eat.
Game has a lead problem of its own, and it comes from the bullet. When 30 deer shot with ordinary lead-core rifle bullets were X-rayed, every carcass held metal fragments, often more than a hundred, and the minced meat from 80 percent of them had at least one. Pigs fed that venison absorbed the lead. Most fragments are too small to see or feel when chewing, and some travel up to 18 inches (about 45 cm) from the wound, so trimming around it removes only part. Venison shot with copper or other lead-free bullets avoids the problem.
Pesticides on produce
Most pesticide residue on fruit and vegetables sits on the surface. Rinsing under the tap removes some. Soaking for 12 to 15 minutes in a bowl of water with baking soda stirred in removes more, though anything that has soaked into the skin stays put. Peeling removes more again.
Switching to organic lowers the pesticide levels in your body within days, and the difference is easy to measure. Whether that changes anyone's health over a lifetime is much less clear. If organic fits your budget, fine. On a tighter budget, spend it on the crops that carry the most residue and that you eat most often.
Spinach tops the latest list, carrying more pesticide residue by weight than any other produce, with kale and strawberries close behind. The greenest thing on the plate turns out to be the one that needs the most washing, and it carries a second load no washing removes, the oxalates the plant makes itself. Healthy Eating's Blind Spot: The Plant Toxins Your Diet Is Built Around covers those, along with lectins and the other toxins plants build in. Both are reasons to treat greens as the side, not the foundation.
Nuts, grains and mould
Some moulds that grow on nuts, grains and dried fruit produce toxins, and the best known of them, aflatoxin, damages the liver. They thrive in warm, damp storage. The rules are easy. Throw away nuts that look shrivelled, discoloured or mouldy, or that taste bitter, and store nuts and grains somewhere cool and dry in amounts you'll finish within a couple of months. Peanuts and peanut butter sold in the US are held to a legal limit for aflatoxin, which makes established brands a safer bet than the bargain bin. Hidden Food Contamination, linked below, has the turkeys that led to its discovery.
Brazil nuts come with extras of their own. The tree's vast roots can draw radium out of the soil, so the nuts carry more of it than common foods do, though still a small amount. A single nut also holds more selenium than an adult needs in a day, enough that eating them by the handful every day takes you over the safe upper limit.
The water and dishes you cook with
Two contaminants in tap water are worth knowing about. Lead comes from old pipes and fittings, and it rises when water sits still in them overnight. Forever chemicals, the PFAS family, come from industry and firefighting foam, and they get into water supplies in some areas.
If your home is old, run the cold tap in the morning until the water feels colder, and take only cold water for anything you drink or cook with, because boiling leaves lead in place and hot water pulls more of it out of pipes. A tells you whether old pipes are adding anything. And if you want a filter, check that it's certified to remove lead and forever chemicals. An does both.
Sometimes the food is fine and the dish is the problem. Traditional glazed pottery, and some imported pottery labelled "lead free", can leach lead into whatever is served or stored in it, sometimes because the kiln that fired it once fired lead glazes. Keep handmade and decorative pieces for display unless they're sold as food-safe, especially for children's meals. Hidden Toxins in Your Personal Care Products, linked below, does the same job for the bathroom shelf.
The ones you can ignore
The olive oil fridge test is one. Put real extra virgin olive oil in the fridge and it may or may not set, and so may a blend, so the test tells you nothing about purity. Buy from producers who print a harvest date on the bottle.
The idea that you can taste mould toxins in coffee is another. Ochratoxin A, a mould toxin, does turn up on coffee beans, as well as on grains, dried fruit and grapes. It's also tasteless. What you can taste is stale or badly roasted beans, which is a separate problem. The shine on supermarket apples is a food-grade wax, often made from palm leaves or the resin of an insect, put on to replace the natural wax that washing removes.
Blood tests sold online as "food sensitivity" panels measure your body's normal response to foods you eat often. They tell you nothing about contamination, and nothing much about sensitivity either.
Lead in bone broth is mostly one to ignore as well. A small test in 2013 of three organic chicken broths found several times more lead than in the tap water they were made with, and the scare spread from there. A larger test of animal bone broths in 2017 put lead and cadmium at a few micrograms a serving, which its authors judged a minimal risk. Make it from good bones and keep drinking it.
Detox teas and cleanses belong on the same list. Your liver and kidneys clear what the body can clear, around the clock, and no tea or cleanse pulls out lead, mercury or arsenic.
Spread it around
Almost every contaminant here becomes a problem through repetition: the same rice every day, the same tuna, the same powder, the same bar of dark chocolate. Variety is the cheapest protection there is, and the plainest foods need the least worrying about. Fresh meat cooked without charring, eggs, and fish from the small end of the chain make a sound base. Offal and shellfish can carry cadmium, so keep them as one part of a varied week. Rotate whatever grains you eat, keep the powders and the cured meat occasional, and the healthy day you started with stays healthy.
Next time you cook rice, boil it for five minutes first and pour that water away.
Wondering what gets into food after it leaves the farm? Hidden Food Contamination: BPA, Microplastics, and Heavy Metals in Your Clean Diet — the packaging, storage and cooking routes that no label covers, and the kitchen changes that close them.
Cleaned up your plate and want to look at your bathroom shelf next? Hidden Toxins in Your Personal Care Products — the ingredients in everyday soaps, creams and cosmetics worth swapping, and simpler alternatives.
Know someone who's gone organic and still worries about every label? Send them this. It might narrow their list down to the few things worth changing.
Tried something here, or got a question it didn't answer? Write to us at contact@allforlife.club. Your questions shape the next articles.
Disclaimer: This article is general information. For advice about your own diet or health, talk to a qualified health professional. If you're pregnant, feeding a baby or young child, or worried about lead or other contaminants in your home, get professional advice and have your water tested.
Affiliate Disclosure: This article contains affiliate links. As an Amazon Associate, All For Life earns from qualifying purchases, at no extra cost to you. We only link to products we would recommend without the commission.
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