According to " How Products Are Made" , there are two types of ingredients that go into making marshmallows, and they are emulsifying agents and sweeteners.
Sorted cod roe has been around for ages, but it's thought that this as a paste was almost an accident when it was emulsified by oil as like an afterthought.
This high fat food stimulates the gallbladder to squeeze out some bile into the small intestine, that bile emulsifies the fat, or basically mixes the fat up, and makes it easier to absorb.
This new set of rules framed unhealthy food less in terms of the nutrients it contains (fats, carbohydrates etc) and more by the degree to which it is processed (preserved, emulsified, sweetened etc).