Jaxon I know we all use it at least I do but I have cut down on using foil with everything when I can. Is it safe to use foil in that way or is it unsafe only if it touches the food? Thanks. Keep up the great cooks!!!!
Aluminum heated to high temperatures will (1) off-gas toxic substances and (2) leach aluminum into the food it contacts. There seems to be adequate proof
for some people that aluminum in the body leads to decreased functions of the central nervous system, Alzheimer’s disease, and bone diseases.
(I don't care to enter into the old discussion that we tolerate other dangerous exposures, including the possible risks inherent in grilled or smoked food. I'm simply addressing Tailgating's question.)
If you're referring to aluminum leaching into food, the aluminum needs to contact the food. If you're referring to the gasses the hot aluminum emits, the problem apparently manifests itself when the gasses are inhaled.
Careful Internet searching will provide hours of reading material.