An hypothesis for the role of plants as they relate to the human body...

The role a plant plays in nature, is related to its role as food or medicine in the body.

This is a hypothesis, or a starting point. Its not an absolute. It is a generality. A framework to engage things from.

Due diligence and research is required. Particularly since some plants / plant combinations can be toxic.

But as a framework, this seems to be true, more often than false.