“Acrylamide forms when foods like potatoes and cereals become crispy and brown. It even forms in roasted coffee beans.” That means acrylamide is in the crunch of potato chips, the crispy edges of French fries, and in toasted snacks and rich roasted coffees. But Stelwagen says it's not as much of a worry as it sounds.
Acrylamide can form naturally from chemical reactions in certain types of starchy foods, after cooking at high temperatures. Some foods with higher levels of acrylamide include French fries, potato chips, foods made from grains (such as breakfast cereals, cookies, and toast), and coffee.
The mean content was 329 μg kg−1 (from <20 to 4000 μg kg−1). French fries prepared from frozen par-fried potatoes reported a lower acrylamide content than those from fresh potatoes, 229 and 460 μg kg−1, respectively.
[Based on FDA studies.] Soaking raw potato slices in water for 15-30 minutes before frying or roasting helps reduce acrylamide formation during cooking. (Soaked potatoes should be drained and blotted dry before cooking to prevent splattering or fires.)
High temperature cooking, such as frying, roasting, or baking, is most likely to cause acrylamide formation. Boiling and steaming do not typically form acrylamide. Acrylamide is found mainly in foods made from plants, such as potato products, grain products, or coffee.
In 2002, scientists reported that acrylamide forms when seemingly healthy carbohydrate-rich foods like potatoes, other root vegetables and grains are cooked at high temperatures by frying, roasting, broiling, toasting or baking.
The link between acrylamide in food and cancer is not clear. The only studies to show a clear link between acrylamide and cancer are animal studies. These involved very high levels of the chemical. Studies that followed people over time did not find a link between eating foods with acrylamide and cancer.
Once in your body, acrylamide enters your body fluids. Acrylamide and its breakdown products leave your body mostly through urine; small amounts may leave through feces, exhaled air, and breast milk.
Tests with antioxidants
Even rosemary in small quantities – in one per cent of the dough – was enough to reduce the acrylamide content significantly. Flavonoids are another type of antioxidant found, among other things, in vegetables, chocolate and tea.
While acrylamide is not an added ingredient, it is a result of frying food, one of the most common methods of cooking at McDonald's. Acrylamide levels are particularly high in fried potatoes.
Frying potatoes to make potato crisps, hash browns or French fries provides favourable conditions for the formation of acrylamide, as potatoes contain high levels of asparagine and can contain high levels of reducing sugars.
Avoid very brown areas. Cook cut potato products such as frozen french fries to a golden yellow color rather than a brown color. Brown areas tend to contain more acrylamide. Do not store potatoes in the refrigerator, which can increase acrylamide during cooking.
For example, baking at lower temperatures will require longer bake times. Prolonged storage and heating time at high temperatures (higher than 120 °C) decrease the acrylamide content but this may also decrease the quality of a food product.
The major food sources of acrylamide are French fries and potato chips; crackers, bread, and cookies; breakfast cereals; canned black olives; prune juice; and coffee. Acrylamide levels in food vary widely depending on the manufacturer, the cooking time, and the method and temperature of the cooking process (5, 6).
The higher the temperature of stir-or deep-frying and the longer the cooking time, the higher the concentration of acrylamide. Avoid scorching of potatoes and vegetables as much as possible when frying. Stop toasting slices of bread when the color of bread is still golden yellow.
It's most likely to be found in grains, potatoes or coffee heated to high temperatures. The U.S. Food and Drug Administration (FDA) cites these food sources as having the highest levels of acrylamide when heated to high temperatures: French fries.
Bread often contains what may be considered to be low amounts of acrylamide. However, due to its high consumption rate, its contribution to dietary exposure is still considerable.
Oats have the second highest acrylamide forming potential of rye, wheat, barley and oats. Several studies have found high levels of acrylamide in oat products that exceed the benchmark limits within the EU. These limits might be strict limits in future which every food producer needs to follow.
As mentioned, when starchy, carbohydrate-based foods such as potatoes, wheat, rice and other grains are heated above 120 °C (by frying, baking, roasting or toasting, for example), the naturally occurring amino acid asparagine reacts with sugars to form acrylamide.
The tables below advise on what to do when preparing these types of products. Cut foods, such as potatoes, to similar sizes. This will help all foods to cook more evenly and help reduce acrylamide formation.
You can limit the amount of acrylamide in air-fried food by cooking it for the shortest amount of time and at the lowest temperature necessary to achieve perfect results. French fries should be cooked until golden-brown, and meat should be cooked to a safe internal temperature.
How can acrylamide affect my health? The main targets of acrylamide toxicity are the nervous system and reproductive system. Nervous system effects such as muscle weakness, numbness in hands and feet, sweating, unsteadiness, and clumsiness were reported in some acrylamide workers.