Eatable RFID tags, already used for medical purposes, may find its way to mainstream someday soon. Concept/protoype "Nutrismart" from design engineering student Hannes Harms, of Royal College of Art in London, shows the potential of RFID and food. Uses will be able to track the food from its start to their stomach. Combined Harms's "Smart Plate" users would be able to track their caloric intake, see potential allergy issues (the hidden peanut in the blend), and allow vegetarians/vegans to stay on their path. All data can be stored on any and all of one's devices, and would allow people to review and track with ease.
I like the tracking concept, but does the tag need to be eaten? It does nothing after ingestions. Placing the tag in the wrapper or container seems like an easier option to stomach, so to speak. If a toothpick piece can tear up a digestion track, I am sure a grain of rice sized metallic object could do something similar.
However, this is an innovative RFID usage model. Before I eat RFID tags, I would like to be able to walk through the supermarket register without taking a single item out of my cart, and pay for it without stopping. RFID tag every product, and it gets scanned at the register.
Eavesdropper