i know the aluminum is coated, on the inside, (sigg) and sigg says if it is dinged the inner coating isn't affected. i got my sigg for a whole 'nother reason though...it is pretty and helps me drink more water when i am not at home! before that we used the old white nalgenes we got back in 1992, reusable bags.com sells them still, supposedly they are safe plastic (?) personally i feel there are many reasons, some undiscovered still, for alzheimer's. my great grandmother was a vegetarian (seventh day adventist) used cast iron almost exclusively (she had some steel pots), had a huge garden and yard in which every day but sabbath she would work in, never smoked, drank, etc. was incredibly healthy (and we always said she would outlive us all

) until she was diagnosed with alzheimers. if aluminum was the (or a) reason a lot more people would have alzheimers i think. whenever i get too crazy about things my dh (toxics specialist) gets me even crazier, with all the things we are exposed to everyday, that we can't control...lol
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