To prevent aluminum from leaching into food when using aluminum cookware, follow these guidelines: Avoid using aluminum cookware for acidic foods or beverages, as acids can cause aluminum to leach. Do not cook with high heat, as this can increase the risk of leaching. Use a protective coating, such as a non-stick coating or a thin layer of oil, to create a barrier between the food and the aluminum. Regularly replace or repair any damaged cookware to prevent exposure to bare aluminum. Finally, consider using alternative cookware materials, such as stainless steel or cast iron, for long-term cooking and storage.