Len is right, aluminum is reactive so acid or high enough heat may cause changes in the foil.
I have 18 & 12 inch wide aluminum. I use the 18 inch to cover pans to make clean up easier. I will still put parchment on the foil on the pans to make things stick less.
Aluminum used to be thought to contribute to Alzheimer's but that research was faulty and has been discredited. It still seems to be floating around the internet. Not sure if there is any other health hazard that has been pointed out but I'll do some research.