7. Salad Dressing
We get it, eating dry lettuce is not very appetizing. You need a little something to make it palatable. Unfortunately, most commercial salad dressings use a nanoparticle called titanium dioxide to add a pleasing white hue.
Titanium dioxide is also a chief ingredient in sunscreen and consuming too much of it has been shown to lead to stomach cancer. You don’t have to eat your salads bare, though. Salad dressing is a surprisingly easy thing to make from scratch.