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Acrylamide: what browning makes, and how to make less of it

Acrylamide is not in food when you buy it. It is made in the pan, from an amino acid called asparagine and the reducing sugars beside it, in the same Maillard reaction that produces the colour and most of the flavour of anything roasted. Which is the awkward part: the browning and the acrylamide are the same process.

This is a population-level exposure question, not a diagnosis, and no single meal is a health event. Acrylamide is classified as probably carcinogenic to humans on the basis of animal evidence, and European assessments concluded that dietary exposure could increase lifetime cancer risk across all age groups without being able to set a safe daily intake. The sensible response is the ordinary one: brown less, vary the diet, and do not build the day around fried starch.

Where it comes from, and why boiling is exempt

The reaction needs three things: the amino acid asparagine, a reducing sugar such as glucose or fructose, and heat above roughly 120 °C in a low-moisture environment. Potatoes are unusually rich in asparagine, and cereals contribute in bread and biscuits, so fried and roasted potato products, bread crust, crispbread, biscuits, breakfast cereals and roasted coffee are where most dietary acrylamide comes from.

Boiling and steaming are exempt for a simple physical reason: water boils at 100 °C, and while there is water in the food the surface cannot get much hotter. Boiled potatoes, steamed vegetables, soups and stews produce essentially none. The moment the surface dries out and the temperature climbs, the reaction starts — which is why the crust of a loaf carries acrylamide and the crumb does not.

Colour is a usable proxy. Golden yellow is early in the reaction; deep brown and dark edges are late in it. This is where the food-agency advice to “go for gold” comes from, and it is unusually actionable for a food-safety message, because it is something you can see.

What the assessments actually concluded

The International Agency for Research on Cancer classifies acrylamide as probably carcinogenic to humans — group 2A — based on clear evidence in animals and limited evidence in people. It is genotoxic in laboratory systems, meaning it can damage DNA directly, which matters because it removes the assumption of a threshold below which there is no effect.

The European Food Safety Authority reviewed acrylamide in food in 2015 and reached the conclusion that follows from that: it could not set a tolerable daily intake, because for a genotoxic carcinogen there is no dose that can be declared safe. Instead it used a margin-of-exposure approach and concluded that current dietary exposure is a concern with respect to cancer risk for consumers in all age groups.

The EU response was regulatory rather than a limit on the plate: Commission Regulation (EU) 2017/2158 requires food businesses to apply defined mitigation measures — variety choice, storage, blanching, frying temperature, colour control — and sets benchmark levels that trigger a review rather than a ban. That is why commercially fried potato products have got noticeably paler over the past decade.

The kitchen changes that actually work

Do not refrigerate raw potatoes. Cold storage converts starch to reducing sugars, and those sugars are one of the two ingredients of the reaction, so a fridge-stored potato browns faster and produces more acrylamide when fried. Keep them cool, dark and dry instead — which also happens to be the advice for glycoalkaloids.

Aim for golden, not brown. Fry and roast at moderate temperatures rather than the maximum, and take chips and roast potatoes out while they are still golden. Toast to light gold and scrape off any burnt edges — burnt is not a flavour, it is the end of the reaction.

Soak cut chips in water for half an hour before frying and dry them well: it removes surface sugars and measurably lowers what forms. Blanching does the same thing and is what industry does.

And keep the whole thing in proportion. Acrylamide exposure is a lifetime-average question, so the meaningful variable is how often fried starch is the centre of the meal, not whether one batch of chips came out a shade dark.

Acrylamide by food group

Bands, not decimals. Where a published quantity for a specific food could not be verified against a document, this surface prints the band rather than a number — and every food below links to its own nutrition page so you can see what else is in it.

What changes the number

• Refrigerating raw potatoes raises the reducing sugars and therefore the acrylamide when they are later fried or roasted.
• Colour tracks it closely: golden is much lower than deep brown, and burnt edges are the worst part of the piece.
• Soaking cut potatoes in water before frying, and drying them well, removes surface sugars and lowers formation.
• Lower frying and roasting temperatures produce less, at the cost of a longer cook.
• Boiling and steaming avoid it entirely, because the surface never exceeds 100 °C while water remains.

Where else these foods are flagged

Foods raised on this page that also sit in a raised band on at least two of the other fifteen. Reassuring bands are not counted, so a row here means the food genuinely collects labels rather than merely getting mentioned a lot.

It is worth reading before removing anything. The lists on this surface were each written for a different person with a different problem, and they converge on the same small group of nutrient-dense foods. Satisfying all of them at once produces a diet nobody designed and nobody has tested.

Talking to someone who can actually test

Nothing on this surface is personal medical advice. If a food genuinely makes you ill, if you have had a kidney stone or a gout attack, or if you are considering removing a food group from your diet, the person to talk to is your doctor, pharmacist or a registered dietitian — they can test for the things that can be tested for, which a table cannot.

Sources: European Food Safety Authority — 2015 scientific opinion on acrylamide in food, including the margin-of-exposure conclusion. · International Agency for Research on Cancer — classification of acrylamide as probably carcinogenic to humans (group 2A). · Commission Regulation (EU) 2017/2158 establishing mitigation measures and benchmark levels for the reduction of acrylamide in food. · Food names and links: the site food database. Checked 2026-09-06.

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