Tokyo and Osaka are only about 2.5 hours away by bullet train, so perhaps you wouldn’t think they’d be that different. But while Kanto (Tokyo, Yokohama, Chiba) holds the image of a glittering metropolis, Kansai (Osaka, Kyoto, Nara) is full of the old, historical aspects of Japan. The most commonly cited difference is the dialects of the two regions. For example, dame in Kanto-ben is akan in Kansai-ben, both meaning something like “wrong, no good.”
So when Japanese people were polled about their food habits, it wasn’t so surprising that the two regions answered very differently.