For instance, check out what’s in McDonald’s eggs:
The egg’s reputation is recovering, but scrambled eggs as a part of McDonald’s breakfast include much more than egg. Their pasteurized whole eggs have sodium acid pyrophosphate, citric acid, and monosodium phosphate (all added to preserve color), and nisin, a preservative. To top it off, the eggs are prepared with liquid margarine: liquid soybean oil, water, partially hydrogenated cottonseed and soybean oils (trans fats), salt, hydrogenated cottonseed oil (trans fat), soy lecithin, mono- and diglycerides, sodium benzoate, potassium sorbate (preservatives), artificial flavor, citric acid, vitamin A palmitate, and beta carotene (color). Though not all bad, these added chemicals may be the reason why homemade scrambled eggs taste so much better than McDonald’s.
More here.