What you may have heard
Concerns have been raised that when you cook food in aluminum foil, the aluminum can seep into the food and may be linked to cancer and other health issues.
What the science tells us
Aluminum foil is generally considered safe for cooking. While it is true that small amounts of aluminum can leach into food when heated, these levels are typically low and not a cause for concern. Aluminum concentrations may vary by type of food (e.g., tomatoes, lemons), cooking temperature, and the ingredients or spices used.
Most people with healthy kidney function can excrete the small amounts of aluminum that may be absorbed by the body. Health risks from aluminum exposure may be greater for vulnerable groups, such as young children or individuals with chronic renal failure (Dordevic et al.).
Supporting Evidence
There is currently no strong evidence that cooking with aluminum foil increases your risk of cancer. A study on food additives and contaminants found that both cooking and storing food in foil can lead to low to moderate increases in aluminum content, especially at higher temperatures or with longer contact times (Ertl & Goessler). However, researchers found these changes to be marginal and not associated with adverse health outcomes under typical use.
Both the World Health Organization (WHO) and European Food Safety Authority (EFSA) have reported that the average person’s aluminum intake from all sources, including foil, remains below harmful levels. The WHO has established a tolerable intake of 2 mg/kg of body weight per week, a limit rarely reached by the general population.
How to reduce your risk
If you are concerned about potential risks from foil and want to minimize aluminum exposure:
- Avoid using aluminum foil with acidic or spicy foods.
- Limit aluminum foil use for young children and individuals with chronic kidney disease.
- Consider alternative options like parchment paper when baking.
Bottom line
Cooking with aluminum foil is generally safe. While excessive aluminum exposure can be harmful, the small amounts associated with regular foil use are not linked to cancer and remain below established safety thresholds.