Aluminium in the diet is best kept as low as possible because of potential harm to the brain and the nervous system. Aluminium pots and pans are safe to use, provided they are NOT cleaned until shiny!
Aluminium protects itself with a hard layer of dull grey oxide. This will prevent any aluminium dissolving in the food. Provided this layer is left intact, aluminium is safe to use. Always wash aluminium with a soft cloth and detergent. Never scour it clean. Any food that leaves the pan bright and shiny - such as rhubarb or vinegar - should not be cooked in aluminium pans.