Various studies have shown that Styrofoam has a detrimental effect on the health of our planet and humans themselves. The chemicals in Styrene (a building block of Polystyrene, of which Styrofoam is made) have carcinogens in them that are well-known to be hazardous to human health.
According to the EPA, "each year Americans throw away 25,000,000,000 Styrofoam cups. Even 500 years from now, the foam coffee cup you used this morning will be sitting in a landfill." In the meantime, they're releasing their hazardous chemicals into the landfills--where there is now a surplus of the environmentally irresponsible cups and other Styrofoam-based utensils sitting as you read this right now.
Take a stand for your health and the health of the environment: ask Whataburger to stop using Styrofoam cups.