Aluminium foil is ideal food packaging for both the home and catering environment. Although traditionally aluminum foil is associated with wrapping hot food, it's also functions for cold food such as sandwiches.
However there is a great of deal of research demonstrating traces of aluminium being passed over to food. Some organisations will shout out advice not to use aluminium foil in food preparation and cooking whilst others are more laissez faire with their attitudes.
In terms of risk assessment, we live in a World based on burning fossils fuels to function which is more lethal for the long term health of the planet and all living organisms yet eating a baked potato cooked in wrapped aluminium foil might be harmful to you.