Popular American food chains are ditching preservatives-filled cheese as demand for quality grows: American cheese slices, a staple for a century in homes the world over — not just in the US — may taste delicious, but their shelf life comes the cost of consumers gulping down sodium citrate, calcium phosphate, natamycin and modified food starch, among other ingredients. Data shows that sales of processed cheese slices are sliding — and will continue to do so as more people turn to organic products, Bloomberg reports (watch, runtime: 0:58)..