Foods help the parts of the body that they resemble?

Somebody just sent me an email about the "Doctrine of Signatures". According to Wikipedia, it is:

[A]n ancient European philosophy that held that plants bearing parts that resembled human body parts, animals, or other objects, had useful relevancy to those parts, animals or objects. [...]

Christian European metaphysics expanded this philosophy in theology. According to the Christian version, the Creator had so set his mark upon Creation, that by careful observation one could find all right doctrine represented...and even learn the uses of a plant from some aspect of its form or place of growing.

Here's an interesting page with some examples. Disclaimer: I have no idea if there's any validity to this, I mainly thought it was interesting because I'd never noticed how much certain foods do resemble the body parts of mammals.