Humans cannot eat stones because of the laws of thermodynamics rather than a lack of the right digestive chemicals.

Nutrition is usually seen as a series of chemical reactions where we break down molecules for energy. This new theory defines eating as negentropic compatibility, or the ability to absorb a specific type of order. Stones are thermodynamically incompatible with the ordered structure of life, so our bodies cannot process them. It suggests that all living things are governed by a rule of order consuming order to stay alive. This shifts the definition of life from a biological process to a fundamental rule of physics.