Is it bad to cook in aluminum foil?

Online Answer
Aluminum foil isn't considered dangerous, but it can increase the aluminum content of your diet by a small amount. ... As you are probably eating far below the amount of aluminum that is considered safe, removing aluminum foil from your cooking shouldn't be necessary.
Related Questions 📌
According to Reynold's Kitchen, the difference in appearance between the two sides of aluminum foil is simply a result of manufacturing and serves no real purpose. Meaning, whether you are cooking your food with the shiny side up or the dull side up, you're doing it right.
Aluminum foil can also be used to cover doorknobs and hardware. Wrap a bit of foil around the knobs to protect them from stray paint drips, and save your painter's tape for baseboards and door frames, where those straight blue edges are far more critical..
Aluminum foil is actually made of two layers: one of aluminum, another that is coating. The surface of the aluminum layer that is in contact with atmosphere oxidizes and turns into aluminum oxide — hence the matte side. In that case, we should use the shiny side, since aluminum oxide is not that healthy.
The difference in appearance between dull and shiny is due to the foil manufacturing process, he said. "In the final rolling step, two layers of foil are passed through the rolling mill at the same time. The side coming in contact with the mill's highly polished steel rollers becomes shiny.
Good news! According the the experts at Reynolds, there really isn't a difference. "Regardless of the side, both sides do the same job cooking, freezing and storing food," Mike Mazza, marketing director for Reynolds Wrap, told TODAY Home via email.