Did You Know – Aluminum Cookware

I love cooking a huge pot of tomato based vegetable soup in my large aluminum pot. We always love the way the acid from the tomatoes turns the pot spot clean and back to the original silver color. After doing some research, I found out that this is not a good thing.

  1. Did you know that cooking in uncoated aluminum can cause the metal to leach into your food?
  2. Cooking wet, acidic foods in uncoated aluminum should be avoided, as it causes more of the metal to leach into the food than dry, non-acidic items do.
  3. Lightweight aluminum is an excellent heat conductor, but it’s also highly reactive with acidic foods such as tomatoes, vinegar, and citrus juice. Such items can cause aluminum to leach into food, causing a metallic taste and leaving the cookware with a pitted surface.
  4. Simmering tomato sauce in an aluminum pot is a recipe for leaching aluminum, not only because it’s acidic, but also because it is salty (salt corrodes aluminum) and liquidy, and because it spends a long time in the vessel, all of which increase the reaction between the aluminum pot and the food.
  5. Baking cookies on an aluminum baking sheet, in comparison, extracts less aluminum because the food is drier, less acidic, less salty, makes less physical contact with the metal, and spends less time cooking.

Aluminum cookware that has been anodized (hardened through a process that renders it nonreactive) or clad in a nonreactive material, such as stainless steel or a nonstick coating, does not leach into or react with foods.

So the bottom line is that cooking in uncoated aluminum will cause the metal to leach into food —how much depends on the food and how long it spends in the pan. If you are concerned, you may wish to cook in aluminum that’s been anodized or clad in a nonreactive material.

Image from http://www.Unsplash.com

Source of material from http://www.AmericasTestKitchen.com

http://www.InDianesKitchen.com

41 Comments »

  1. I like making yogurt and aluminum or any metal for that fact kills bacteria. And in this case your yogurt culture would be affected. I also eat any cultured food with a plastic or wooden spoon – metal and even silver plate utensils will kill the good bacteria in these foods when eating them.

  2. Quite a few years back we replaced all of our aluminum pots with stainless steel and cast-iron pots — also after reading that aluminum pots are not the healthiest option.

    • Smart Corna, cast iron outside and stainless inside? I have a lot of cast iron pots and pans but I am starting to have trouble lifting them. Luckily we have plenty of stainless too. My dad has too much iron in his blood so he can’t use cast iron. His doctor told him to donate blood monthly to keep his iron levels down.

  3. This is good to know! Aluminum leaching into food doesn’t sound too appealing to me so I will look into the alternatives you suggested! Thanks Diane. 🙂

  4. I read something about this but not all the details. Thanks for sharing Diane! I am pretty sure we don’t have any left in our kitchen but I’m going to check

  5. Best to stick with good ole stainless or cast iron.
    Did you know that cooking with cast iron can help with an iron deficiency?
    It works about the same as the aluminum leaching.
    Also, rubbing a lemon on aluminum will give it a nice shine.

    • I did know that about cast iron. My dad has too much iron in his blood, no cooking with cast iron. The doctor has him donate blood every month and it reduces the iron in his blood without taking any other steps. I didn’t know that about the lemon, however, did you know soaking copper in vinegar shines it up?

  6. Good information. I used to use aluminum foil to cover leftover lasagna, etc. I can attest to aluminum’s reacting to acidic tomato sauce! Thanks, Diane.

  7. I didn’t know that Diane – these are helpful posts and I always learn something. I know tomato is hard on your stomach though, like the old penny test in a glass of Coke – completely cleans it up!

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