Regardless, a lot of soy is consumed in terms Soy Sauce (Tamari, which traditionally comes from making -->), Miso, Natto, the Yuba noodles, and {in China more) is their version of cheese {fermented Tofu). The Yuba noodles are also common in China, though I have no idea how to write it in Roman characters.
Southern Japan/Taiwan, and Northern Japan in summer{say Akita, Aomori) do use Tofu as main dish for its cooling effect on body, and is not a heavy/bloat feeling. Though this would be more of a Lunch meal. Nama-Doufu for one. A partial block of Tofu sprinkled with Fresh,Grated Ginger (Shoga) root, and Shoyu.