Contaminating food with semiconductors (especially food that's expected to be heated to very high temperatures in some dishes, perfect for breaking down already non-edible chemicals into even more reactive pollutants and then actively drawing them out of the semiconductor to where it's more readily absorbed by the intestines.) Look up some of the chemicals used to create the semiconductor effect in silicon. Arsenic is a really common one. It's locked away in the silicon crystal and harmless when outside your body, but inside your body when exposed to the heat of cooking and then strong acid in your stomach, who knows?!

Making your own product worse to own the counterfeiters. One of the biggest reasons for avoiding counterfeit food is the higher risk of contaminants, well now that the genuine product is contaminated what's the goddamn point?

Probably not preventing counterfeiters as in "they're selling a block of flour and passing it off as cheese", because you don't need a chip to detect that. More like "it didn't come from this very specific region in Italy by the established cheese monopoly, but it's pretty much identical otherwise." Protecting the brand and its profitability, not the consumer.

Literal fucking food DRM. Remember when this used to be satire?