A study has found that boxed mac and cheese contains high levels of phthalates, endocrine disruptors which reduce testosterone levels. It's not a food additive, the cheese powder absorbs the phthalates from the production equipment. The news article says:
“The phthalate concentrations in powder from mac and cheese mixes were more than four times higher than in block cheese and other natural cheeses like shredded cheese, string cheese and cottage cheese,” said Belliveau.
The FDA is aware of phthalates in our food and considers them to be “indirect food additives.” That’s not exactly reassuring. A FDA spokesperson told The Times, “The F.D.A. continues to monitor literature and research on these compounds as it becomes available.” Europe has already gotten rid of many phthalates in food production, so there’s hope that maybe with enough recognition of the issue the U.S. could follow suit.