Tin foil is harmless to human body, and only metal lead is harmful to human body. Tin foil can be used to wrap food, but it can't be baked directly with fire, which is easy to produce toxins and is directly harmful to human body. Generally, tin foil can be baked in the oven or fried in oil, but this method is easy to produce benzopyrene, dioxin and other substances, so it is not suitable to eat more.