@electro_neanderthal
Idk, all I can say is "tastebuds, man." I grew up eating Japonica and Calrose rice and I 100% would be just like an isekai MC if I were away from it for too long. Bread, pasta, potatoes, etc I could live without if I needed to, but I'd go crazy without rice.
Edit: tbf tho, most other types of rice other than Japonica and Calrose are mediocre at best and to expect another world to have anything as tasty as those strains would be ludicrous