You can tell American cheese is bad for you simply by looking at it. Individually wrapped slices of cheese, such as Kraft Singles are packed with terrible ingredients, including sodium citrate, which has been known to cause muscle spasms, as well as sodium phosphate, which has been linked to osteoporosis and kidney problems. Not to mention the unnatural food coloring used to give it that yellow glow. Is it really worth adding one to your sandwich?
Not all cheeses are evil, though it is worth cutting back if you're eating it every day. If you're looking for an alternative to unhealthy American cheese, try something organic and more natural, such as cheddar or parmesan. Of course, make sure it's fresh and doesn't contain any preservatives or artificial coloring. It might be a bit more expensive, but could save you some health issues!