Experts Say Aluminum Foil Use Is Generally Safe but Caution Advised at High Heat

Aluminum foil is widely used in kitchens for baking, grilling, wrapping, and storing food. However, concerns have resurfaced about whether high-temperature use can cause aluminum to leach into food and affect health. Experts explain that while aluminum foil is generally safe, certain conditions can increase aluminum transfer to food.

Aluminum is a naturally occurring element found in air, water, soil, cookware, medicines, cosmetics, and deodorants. Most exposure comes from food, including contact with aluminum foil. The foil typically contains about 98.5% aluminum, with additives for strength and durability. Earlier worries linked aluminum exposure to Alzheimer’s disease, but extensive research has found no causal connection. The US National Institutes of Health states that cooking at high temperatures or with acidic and salty foods may increase aluminum migration, but the amounts are usually safe and mostly excreted by the body.

Foods that absorb more aluminum include acidic items like lemon or tomatoes, salty foods, those with high moisture content, and meats or fish marinated in lemon juice or vinegar. Dry, non-acidic, and low-salt foods absorb less aluminum. It is recommended to use aluminum foil in ovens up to about 200 degrees Celsius and for grilling. Cooking above 220 degrees Celsius significantly raises aluminum transfer. Experts advise against lining the bottom of ovens with foil to avoid damaging heating elements and affecting oven performance. Instead, placing a foil-lined baking tray is preferable.

For those wishing to reduce aluminum exposure, parchment paper is a good alternative, safe up to 220 degrees Celsius and non-reactive with acidic foods. Although aluminum exposure is safe for most people, recent studies suggest that individuals with chronic kidney disease and young children may be more sensitive and should exercise extra caution.