Diffrence between pokemon and real world bugs. 
"Misty is scared when she sees a Caterpie, and Ash tries to calm her down by reminding her that it's a Bug-type Pokémon rather than a "real" bug. 
Pidgeotto is seen eating a regular worm before being captured by Ash." 
Examples of Normal food, somebody mentioned wanting some proof. 
"Brock attempts to attract customers to a restaurant by advertising unusual animal-themed dishes, including french-fried flounder, seven-layered crab cakes, squid on a stick, and clam juice snowcones."