Acrylamide: Are Gummies Poisoning You?

Acrylamide: Understanding Exposure, Health Risks, and Prevention

WARNING: Consuming some products can expose you to chemicals including acrylamide, which is known to cause cancer.

Look at the ingredients list on a pack of popular gummies and you may see 'acrylamide' on that list.

Acrylamide is a chemical compound that has attracted scientific and public attention because of its presence in certain foods and its potential health effects. 

Unlike many known toxic chemicals that are deliberately added to products, acrylamide can form naturally during common cooking processes. It is created when certain plant-based foods containing sugars and the amino acid asparagine are heated at high temperatures.

For most people, the main source of acrylamide exposure is through the diet. Although acrylamide exposure from food is usually much lower than levels associated with industrial exposure, researchers continue to study its possible long-term effects.

How much is toxic?

Acrylamide toxicity depends heavily on body weight, exposure pattern, and duration:

1 mg total (1,000 micrograms) is a small amount compared with doses known to cause acute poisoning in humans.

However, acrylamide is treated as a potential cancer risk over long-term exposure, so the concern is not “one small dose causes poisoning,” but rather repeated exposure over time.

For perspective:

A person weighing 70 kg consuming 1 mg once would receive about 0.014 mg/kg body weight.

A person consuming 1 mg every day for years would have a very different exposure scenario though.

Understanding acrylamide toxicity requires separating two different concepts: acute toxicity, which refers to harmful effects from a large dose over a short period, and chronic toxicity, which refers to possible health effects from repeated exposure over time.

What Is Acrylamide?

Acrylamide is a small organic molecule with the chemical formula C₃H₅NO. 

It is used industrially in the production of polyacrylamide materials, which are used in areas such as water treatment, paper manufacturing, and laboratory applications.

The compound became a major food safety concern in 2002 though, when researchers discovered that acrylamide forms naturally during the cooking of certain foods like potato chips. This discovery changed the way scientists viewed exposure because it showed that a potentially harmful chemical could be produced during ordinary food preparation.

Acrylamide formation occurs mainly through the Maillard reaction, a chemical process responsible for browning and developing flavours in cooked foods. During this reaction, the amino acid asparagine reacts with reducing sugars such as glucose and fructose when exposed to high heat.

The conditions that encourage acrylamide formation include:

- High cooking temperatures, usually above approximately 120°C (248°F)

- Longer cooking times

- Low moisture conditions

- Browning or burning of food surfaces

Sources of Acrylamide Exposure

Food

For the general population, food is the primary source of acrylamide exposure. Foods that commonly contain higher levels include:

- Potato chips and crisps

- French fries

- Roasted coffee

- Toasted bread

- Biscuits and crackers

- Breakfast cereals

- Some baked goods

The amount of acrylamide varies widely depending on ingredients, cooking methods, temperature, and cooking time. For example, lightly toasted bread generally contains less acrylamide than heavily browned or burnt toast.

Industrial Exposure

Acrylamide is also used in industrial settings. Workers involved in manufacturing or handling acrylamide-containing materials may be exposed through:

- Skin contact

- Inhalation of dust or vapour

- Accidental ingestion

Industrial exposure can be significantly higher than normal dietary exposure and has historically been associated with neurological health concerns.

How Acrylamide Affects the Body

After entering the body, acrylamide is absorbed through the digestive system, lungs, or skin. It is then metabolised, primarily in the liver, into a compound called glycidamide.

Glycidamide is important because it can interact with DNA and has been identified as one of the substances responsible for acrylamide’s potential cancer-related effects.

Acrylamide and its metabolites may affect several biological systems, including:

- The nervous system

- Reproductive systems

- DNA integrity

- Cellular processes involved in cancer development

Acute Acrylamide Toxicity

Acute toxicity refers to harmful effects caused by a large exposure over a short time.

In humans, high-dose acrylamide exposure has been associated with neurological symptoms. Reported effects may include:

- Numbness or tingling sensations

- Muscle weakness

- Difficulty with coordination

- Balance problems

- Fatigue

- Reduced reflexes

Severe cases involving very large exposures can affect the nervous system more seriously.

There is no officially established single “toxic dose” for humans because documented poisoning cases vary and controlled experiments at dangerous exposure levels cannot be performed in people. Toxicologists therefore use available human reports, animal studies, and occupational exposure data to estimate risk.

Animal studies indicate that very high doses can produce serious neurological effects and may even be fatal.

Chronic Toxicity and Cancer Risk

The main concern surrounding acrylamide exposure from food is not immediate poisoning but the possibility of long-term health effects.

The International Agency for Research on Cancer classifies acrylamide as Group 2A: probably carcinogenic to humans. 

This classification means there is strong evidence that acrylamide can cause cancer in animals, while evidence in humans is limited or not yet conclusive.

Animal studies have shown that acrylamide exposure can increase the risk of certain cancers. Scientists believe this may occur because glycidamide can damage DNA, potentially leading to mutations.

Human studies have been more difficult to interpret because:

- People are exposed to many chemicals throughout life

- Dietary exposure varies greatly

- Measuring long-term intake accurately is challenging

- Cancer development is influenced by many factors

Current scientific understanding suggests that reducing unnecessary exposure is a sensible precaution, even though the exact level of risk from normal dietary intake remains uncertain.

How Much Acrylamide Is Dangerous?

Acrylamide risk depends on the type of exposure.

Acute exposure

Very large doses can cause neurological toxicity. Reported toxic exposures in humans have generally involved much higher amounts than those encountered through normal food consumption.

Long-term exposure

For cancer risk, scientists do not identify a clear “safe” threshold. Instead, risk is considered to increase as exposure increases. Because of this, food safety agencies focus on reducing acrylamide levels where practical.

A typical dietary exposure is usually measured in micrograms (millionths of a gram), while industrial or experimental toxicology studies often involve larger amounts.

Factors That Influence Risk

Several factors affect how acrylamide exposure may influence health:

Amount consumed

Eating a high-acrylamide food occasionally is different from consuming large amounts frequently.

Cooking habits

Foods cooked until very dark brown or burnt generally contain more acrylamide than lightly cooked foods.

Individual differences

Age, body weight, genetics, metabolism, and overall health can influence how the body processes chemicals.

Diet quality

A varied diet containing fruits, vegetables, whole grains, and minimally processed foods can reduce reliance on foods that commonly contain higher acrylamide levels.

Reducing Acrylamide Exposure

Completely eliminating acrylamide exposure is somewhat unrealistic because it occurs naturally in some cooked foods. However, several practical steps can reduce intake.

Avoid over-browning foods

Cook foods until they are golden yellow rather than dark brown or burnt.

Use lower-temperature cooking methods

Boiling, steaming, and microwaving generally produce less acrylamide than frying, roasting, or baking at high temperatures.

Store and prepare potatoes correctly

Storing potatoes in very cold conditions can increase sugar levels, which may contribute to acrylamide formation during cooking. Following recommended storage practices can help.

Maintain a balanced diet

Eating a wide range of foods reduces dependence on any single source of exposure.

Acrylamide in Processed Foods and Sweets

Acrylamide is often discussed in relation to baked and fried foods, but it can also form in some processed products where sugars are heated. For example, caramelised ingredients may contain small amounts depending on processing conditions.

However, in many confectionery products, the primary nutritional mainstream concern is usually not acrylamide but high levels of added sugars. 

Regulation and Food Safety

Food safety authorities around the world continually monitor acrylamide levels and encourage manufacturers to reduce its formation.

Strategies used by food producers include:

- Selecting ingredients with lower acrylamide-forming potential

- Adjusting cooking temperatures and times

- Changing manufacturing processes

- Using enzymes or other techniques to reduce precursor compounds

Consumers can also reduce exposure through cooking choices and dietary variety.

Conclusion

Acrylamide is a chemical compound that forms when certain foods are cooked at high temperatures.

It is considered a substance of concern because of evidence linking high exposure to neurological effects and possible cancer risk.

The greatest risks are associated with very high exposures, particularly in industrial settings or experimental studies. For everyday consumers, the most effective approach is reducing any unnecessary exposure.

Scientific understanding of acrylamide continues to develop. 

While the exact level of long-term risk from normal dietary exposure remains an area of research, reducing exposure where practical is a reasonable and widely recommended approach.