Regarding food, women can all understand some common sense things, such as what makes you whiter when eaten, what makes you fat when eaten, what makes you have spots when pigments are deposited after eating...
However, when it comes to how to pair food, they may not be fully understood.
In fact, some foods individually have no nutritional deficiencies whatsoever, but once paired with other foods, they might very well have a significant "disfiguring" effect.