The use of styrofoam allows “styrene”, the single-molecule form of ‘polystyrene’, to migrate into your food or drink when used as a container. Biopsies of fat from human subjects found styrene residues in 100% of the samples tested. If you drink water, tea, or coffee from polystyrene cups four times a day for three years, you have consumed about one styrofoam cup-worth of styrene along with your beverages. The amount that migrates into solid food is dependent upon the fat content of the food (the higher the fat content the greater the styrene migration). The rate of migration also increases with temperature (e.g., hot coffee absorbs the most). The health concerns related to this are numerous and readily available to read about on the internet.