Emilie Meyer
Metal pans, especially non-stick pans, can leach chemicals and toxic metals into food. Non-stick pans are often coated with polytetrafluoroethylene (PTFE) or Teflon, which can break apart and emit toxic particles and gases when heated. Perfluorooctanoic acid (PFOA), another chemical previously used in non-stick pans, has been linked to various health issues, including cancer and developmental abnormalities. Additionally, scraping metal pans with utensils can damage the non-stick coating, exposing the metal beneath, which can leach small amounts of metal into food. While chromium and nickel leaching from stainless steel pans is generally considered safe, certain metals, such as lead and aluminium, pose more significant health risks.
| Characteristics | Values |
|---|---|
| Scraping metal pans | Can cause the release of metal and chemicals into food |
| Type of metal | Chromium, nickel, iron, aluminium, copper, lead, cadmium |
| Toxicity | Metal toxicity can cause serious health issues |
| Non-stick pans | Teflon and PFOA coatings can break apart and release toxic particles |
| Alternatives | Ceramic cookware, stainless steel, cast iron |
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What You'll Learn
Non-stick pans can be dangerous when scraped
Non-stick pans are popular due to their convenience and ease of use. However, it is important to be aware of the potential dangers associated with their use, especially when they become scratched or damaged.
Non-stick pans are coated with a chemical compound known as PTFE (polytetrafluoroethylene), commonly known by the brand name Teflon. While PTFE itself is considered safe, older non-stick pans may contain PFOA (perfluorooctanoic acid), a chemical that was used in the production of Teflon until 2015. PFOA has been linked to health issues, including cancer, and environmental concerns.
When a non-stick pan becomes scratched or chipped, the coating may flake off and mix with your food. This is particularly dangerous with older pans that may contain PFOA. Even with newer pans, scratches can expose the metal beneath the coating, leading to rust and a negative impact on the taste of your food.
To avoid these issues, it is recommended to replace any non-stick cookware when the coating is damaged, especially if it was manufactured before 2015. Additionally, avoid using metal utensils on non-stick pans, as they can cause scratches. Instead, opt for rubber or wooden utensils. Hand washing with a soft sponge and storing with a cloth towel can also help prevent scratches and prolong the life of your non-stick pans.
While stainless steel, cast iron, and carbon steel pans are safer alternatives that do not use toxic chemicals, it is important to note that even these pans can leach small amounts of chromium, nickel, and iron during cooking, especially when new. However, these metals are naturally present in soil and food and are considered safe and even essential in trace amounts.
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Stainless steel pans leach safe levels of chromium and nickel
It is true that stainless steel pans do leach chromium and nickel into food during the cooking process. However, it is important to note that these metals are leached in safe levels. Chromium and nickel are already present in the soil and most foods, and are essential nutrients for humans. While nickel has not been identified as an essential nutrient, it is also not considered toxic at the levels leached from stainless steel pans.
The amount of nickel and chromium leached depends on the grade of stainless steel, cooking time, and previous usage. Longer cooking durations and cooking with new stainless steel pans result in higher levels of metal leaching. For example, after six hours of cooking tomato sauce in a new stainless steel pan, nickel and chromium concentrations increased up to 26- and 7-fold, respectively. However, metal leaching decreases with subsequent cooking cycles, and by the tenth cycle, the average amount of nickel and chromium leached was 88 μg and 86 μg, respectively, per 126 g serving of tomato sauce.
It is worth noting that stainless steel is widely used in the food and beverage industry due to its thermal conductivity and resistance to corrosion. Grades 304 and 316 are the most commonly used. However, individuals with nickel and chromium sensitivities should be cautious, as exposure to these metals can cause adverse health effects such as allergic contact dermatitis. It is recommended that nickel-sensitive individuals switch to cookware made from materials other than stainless steel.
Overall, while stainless steel pans do leach chromium and nickel, the levels are safe and comparable to the amounts naturally present in most foods. However, for individuals with sensitivities or allergies to these metals, it may be best to avoid using stainless steel cookware or take precautions to minimize metal leaching, such as using well-seasoned pans and reducing cooking times.
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Aluminium pans are unsafe due to metal leaching
Aluminium is not an essential element for humans and is, in fact, a toxic metal ion. Aluminium pans are the most commonly used cooking utensils in rural areas. Metal leaching occurs when the food being cooked chemically interacts with the pot or pan, especially with acidic foods over long periods. This can happen with aluminium, cast iron, or stainless steel cookware.
While metal leaching can alter the food being cooked and the cookware used, there are no significant health concerns related to metal leaching. However, some studies have shown that aluminium leaching increases with low pH values. For example, red cabbage cooked with lemon juice at pH 2.6 showed 5.1 mg Al/100 g red cabbage. Tomato sauce cooked with and without sugar showed 2.7 ± 0.2 and 4.9 ± 0.2 mg Al/100 g tomato sauce, respectively.
In another study, the addition of cider apple vinegar decreased aluminium leaching when cooking red cabbage. Similarly, preparing tomato sauce with white sugar was found to decrease aluminium leaching. It is important to note that storing acidic food in aluminium containers for 48 hours in a refrigerator did not significantly increase aluminium leaching, indicating that short-term storage at low temperatures is not a cause for concern.
While aluminium leaching may not pose significant health risks, it is important to be aware of the potential for increased leaching when cooking with certain ingredients and recipes.
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Teflon non-stick pans emit toxic particles and gases
Teflon non-stick pans are a common kitchen item, approved by the US FDA as safe for food processing. However, concerns have been raised about the potential health risks associated with their use.
Teflon is a brand name for a chemical coating called polytetrafluoroethylene (PTFE), a type of plastic that is sprayed on items and baked to create a non-stick, waterproof, and non-corrosive surface. While Teflon itself is considered safe for ingestion, the coating may begin to break down and release toxic fumes when heated above 500°F (260°C), or 570°F (300°C) according to some sources. These fumes can cause polymer fume fever, characterised by flu-like symptoms. To minimise the risk of fume inhalation, it is recommended to avoid preheating empty pans, cook on low to medium heat, and ensure proper ventilation during cooking.
The primary concern surrounding Teflon-coated cookware is the presence of perfluorooctanoic acid (PFOA), which was previously used in its manufacturing. PFOA has been linked to health issues such as chronic kidney disease, liver disease, thyroid disorders, testicular cancer, low birth weight, and infertility. While PFOA has been eliminated from the manufacturing process, traces of it have been found in some Teflon-coated cookware, raising concerns about potential health impacts.
Additionally, there are ongoing debates about the toxicity of PTFE itself. Some studies suggest that PTFE-coated cookware releases gases and chemicals of mild to severe toxicity, even at normal cooking temperatures. However, the toxicity and fate of ingested PTFE coatings are not yet fully understood, and solid conclusions are lacking.
While the use of Teflon non-stick pans is generally considered safe for everyday cooking, it is important to follow basic safety precautions to minimise potential health risks. Proper ventilation and avoiding high temperatures during cooking are crucial to prevent the release of toxic fumes. Regular inspection and replacement of scratched, peeled, or chipped Teflon coatings are also recommended to maintain the integrity of the non-stick surface.
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Glass cookware can contain lead
Scraping metal pans do not cause them to release dangerous amounts of metal into food. While stainless steel pans do leach chromium, nickel, and iron into food, it is in safe and even essential amounts. In fact, the amount of chromium and nickel leached is so small that it is comparable to the amount naturally present in soil and food. Similarly, while non-stick pans can be damaged by scraping with metal utensils, this does not cause them to become unsafe.
Glass cookware is generally considered a safe option for dishes and drinkware. However, lead and cadmium were once commonly used in the manufacturing process to strengthen glassware, make it more transparent and expensive-looking, and enable it to be etched with intricate designs. Exposure to even small amounts of lead can have harmful effects on health and cause lead poisoning. Therefore, it is important to ensure that any glass cookware is free from these toxic substances.
Nowadays, lead-free crystal should be the norm when purchasing new, high-quality glassware made in the US or Europe. Glassware produced in these regions since 1978, when lead-based paint was banned, should be safe to use. However, products made by large manufacturers often come from areas with less stringent regulations, so it is important to check the manufacturing location. Antique or second-hand goods should also be checked for manufacturing dates, with items produced before 1978 potentially containing lead.
While leaded glassware is generally unsafe, studies have shown that, with the exception of lead crystal, there is very limited migration of lead or other toxic elements from glass. When tested under normal use conditions, no detectable levels of lead migrated from soda lime glass samples, even when deeply scratched to represent extreme use over time. However, when tested with a highly acidic solution, about one-third of the samples showed low levels of lead migration. Therefore, it is recommended to avoid using glassware with decorations that come into contact with food or drink and to be cautious when using glassware with a high percentage of recycled content, as green glass typically has the highest percentage.
To ensure the safety of glass cookware, it is important to purchase products from reputable brands that adhere to strict safety regulations. For example, IKEA has a good reputation for keeping lead and cadmium out of their products, and their enameled cast iron cookware offers excellent non-toxic credentials at competitive prices. Additionally, the Visions brand of glass cookware has been tested and found to be free of lead, cadmium, and other metals, making it a pure and non-toxic option. Glass cookware by Leaves and Trees has also been tested and found to be free of lead and other metals of concern.
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Frequently asked questions
Metal pans can leach a small amount of metal, especially when they are new. Stainless steel pans, for example, can leach chromium and nickel, but in safe and even essential forms and levels. Acidic foods such as tomato sauce can cause more metals to leach into food.
The human body can be seriously affected by heavy metal toxicity. Exposure to heavy metals such as Fe, Cr, Cu, Al, Cd, Ni, Pb, and As can cause cellular toxicity and have been linked to cancer, hormone disruption, weight gain, and digestive issues.
Non-stick pans such as those made from Teflon should not be scraped with metal utensils as this can cause the non-stick coating to come off and expose the metal beneath, which can then rust. Ceramic cookware is considered safer than non-stick pans as it does not leach chemicals into food.
