There was confusion inside Nintendo over whether Mario eats mushrooms
Briefly

Developers of Mario Kart World faced a humorous yet existential question about whether Mario eats mushrooms or only touches them to gain powers. This discussion arose as they planned to integrate new food mechanics, specifically hamburgers, into the game. With this new addition, Mario Kart World producers sought confirmation from seasoned Nintendo executive Takashi Tezuka about the mushroom mechanics established in earlier Mario games. Their playful inquiry reaffirmed that Mario does indeed eat mushrooms as part of his transformation process.
Yabuki: Then, the question came up: "Does Mario, in fact, eat mushrooms?" (Laughs) Jikumaru: So in the midst of development, we went up to Tezuka-san and asked him to confirm, "Is Mario actually eating those mushrooms?"
The addition of hamburgers (and other regional foods that cause wardrobe changes) to Mario Kart World forced Yabuki and Jikumaru to face a fact about the rules of the Super Mario universe.
Though, it's utterly ridiculous.
Tezuka-san answers, "Yeah, he is."
Read at Polygon
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