Another material that we use is to pack food is aluminum foil. Hot and cold food both will be packed and given for lunch or to take away. Human body can take some amount of aluminum in the system.
High aluminum intake may be harmful to some patients with bone diseases or renal impairment. It also reduces the growth rate of human brain cells. Aluminum is significantly more likely to leach into food, and at higher levels, in acidic and liquid food solutions like lemon and tomato juice than in those containing alcohol or salt. It is safe to wrap cold food in aluminum foil than hot foods. Leaching levels climb even more when spice is added to food that is cooked in aluminum foil. Anything acidic sparks a particularly aggressive process that dissolves layers of aluminum into food.