"I don't know," Ken confesses. "Humans benefit from variety, so I've been doing the same for Wormmon. But...."

Oh, here is something he had not thought of, in the moment. Ken blinks.

"....My friends give their Digimon snack foods. And my mother likes to make sweets."

He'd only been giving half of the story, hadn't he? Ken works through the rest out loud. "I see. I'm sensitive to Wormmon's diet so we can enjoy Mama's desserts."