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.
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 most people never think to check.
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. Everyday fruit juice for small children is a good example: several popular apple and grape juices have carried enough lead and arsenic to matter at half a cup a day, so whole fruit and water make better daily drinks.
So the useful question is simple: which of the foods you eat most often carry something worth reducing, and what's the easiest way to reduce it.
Rice and arsenic
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 and rice milk concentrate it further, and rice milk is a poor everyday drink for young children for this reason. Babies take in the most for their size, so rotate infant cereals between oat, barley and multigrain instead of relying on rice, 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. 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 some company on the plate across the week: oats, barley, quinoa and potatoes contain far less.
Big fish and mercury
"Mad as a hatter" comes from nineteenth-century hat makers, poisoned by the mercury they used to treat felt, and the brain is still where mercury does its damage. 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 happen to be the best source of the fats people eat fish for in the first place. Sardines, salmon, anchovies, herring and trout are all low. Canned light tuna has less than albacore, and tuna steaks sit higher still. 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. Plant-based powders tend to carry around nine times as much lead as dairy ones, and plenty of the dairy powders still have more than you'd want every day.
Most people already eat enough protein from food, so a daily scoop is often an expense rather than a need. 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 simply 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 open after harvest. The darker the chocolate, the more cacao it contains and the more of both it tends to hold. A square of dark chocolate is a fine treat. Two tablespoons of raw cacao powder in a smoothie every morning is a different amount altogether.
Cinnamon has had its own problem. Several brands of ground cinnamon were pulled from shelves for lead contamination in recent years, after fruit pouches sweetened with it poisoned children.
Turmeric has a similar story. In parts of South Asia, lead chromate, an industrial yellow pigment, has been added to turmeric to brighten its colour and fetch a better price. That matters most if you take turmeric every day, in golden milk or capsules. For every spice, buy from established brands, and treat cheap, unusually vivid loose powder of unknown origin with some suspicion.
Charred and cured meat
Bacon, ham, salami and other processed meats are the best-established food cause of bowel cancer, and they share that category with tobacco for how sure the link is, though the size of the risk is much smaller. The curing chemicals and the way processed meat is made both play a part. That makes them a sometimes food.
Fresh meat has its own issue at high heat. When meat chars on a grill or in a scorching pan, the blackened parts form compounds that damage DNA. You can cut most of them out without giving up the barbecue: marinate the meat first, turn it often instead of leaving it to blacken, and trim off the burnt bits before you eat.
Pesticides on produce
Most pesticide residue on fruit and vegetables sits on the surface. Rinsing under the tap removes some. Soaking for ten to fifteen minutes in a bowl of water with a teaspoon of baking soda stirred in removes more, though anything that has soaked into the skin stays put. Peeling removes more again, and takes some of the best nutrients with it.
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 for everything, fine. On a tighter budget, spend it on the crops that carry the most residue and that you eat most often, such as strawberries, spinach and kale, and buy the rest conventionally. Eating plenty of produce matters far more than how it was grown.
Nuts, grains and mould
Some moulds that grow on nuts, grains and dried fruit produce toxins, and the best known of them damages the liver. They thrive in warm, damp storage. The practical 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 from established brands are checked for it, which makes them a safer bet than the bargain bin.
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. So-called forever chemicals come from industry and firefighting foam, and they get into water supplies in some areas.
If your home is old, run the cold tap for a minute or two in the morning until the water feels colder, and use cold water for drinking and cooking, because hot water pulls more lead 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 ceramic dishes can leach lead into whatever is served or stored in them, even when they're labelled lead-free, and acidic foods like tomato sauce, fruit juice and anything with vinegar pull out the most. Keep handmade and decorative glazed pieces for display unless they're sold as food-safe, especially for children's meals.
The ones you can ignore
The olive oil fridge test is one. Real extra virgin olive oil can stay liquid in the fridge and blends can set, 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. You can taste stale or badly roasted beans, and that's all. 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.
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. Rotate your grains, eat fish from the small end of the chain, keep the powders and the processed 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.
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.
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