The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein.
Such a quantity of material would have blocked the sunlight completely from reaching the surface, plunging Earth into a period of cold and darkness that lasted at least several months.
As human beings (ourselves) are detached from civilization to access a lifestyle of scanty materials, our inner animality generated from primitive natural habitat is emancipated.
For example, humans also have natural aversions to the bitterness of coffee or the harshness of tobacco, but those substances have some addictive qualities, which might make them desirable.
The distinction between pheromones and odorants—chemicals that are consciously detected as odors—can be blurry, and some researchers classify pheromones as a type of odorant.