I know. This is a stupid topic. But with so many references that TFs make to human food in various continuities, I wonder. Personally, I don't see how a non-carbon based lifeform can derive any nutrition from carbon-based food. If TFs are biomechanical, as in the movies, and made up of billions of self-replicating nanobots, and consequently capable of growth and healing, it stands to reason that in addition to energy, they would need to ingest nutrition. That nutrition would be in the form of the elements and compounds their bodies are made out of. If one of the elements in their bodies is iron, they may have to ingest iron. Chewing solid iron would be difficult and cumbersom even for a robot. So they may ingest it in a thin flakes or in a liquid ion form. They would need some type of circulatory system to deliver the nutrients to all the billions of microscopic nanobots just like we need one for our cells. In "Transformers Prime", it is made clear that TFs have veins that transport Energon with most likely at least one heart pumping that Energon. Nutrients are probabely dissolved into the Energon just like they are in our blood. But could they eat human food, even if it gives them no nutritional value what-so-ever, without getting really sick?