How does using aluminum cookware affect your health?

It has not been shown that the minute amount of aluminum which can enter food via cookware is clinically significant, with the exception of cooking acidic foods (like tomato sauces, balsamic vinegar) in them. Most aluminum in the body comes from baked goods (bread, doughnuts, cakes) due to the use of baking powder which includes aluminum diphosphate. If you're still hesitant, a better choice may be the use of stainless steel cookware.