On another note, is it me or is every single isekai now obsessed with showing just how much the MC loves eating?
It's not just Isekai either - some of my wholesome lesbian romcoms, BAM cooking recipe out of nowhere. Traveling slice of life manga, BAM food porn out of nowhere time (though at least it's appropriate there). Post-apocalyptic survival... BAM cooking chapter! Zombie sruvival manga? Yes, food! There's even a drama about a totally broken family (by Japanese standards, I think they're fine) where the oldest brother was adopted because his mother was a total 'ho, the dad is dead, the mother has cancer, then they run into another younger brother the 'ho mother had... and of course all of this comes with a cooking lesson every chapter.
(Gin no Spoon, BTW, and it's way more wholesome than it sounds).
It's definitely everywhere way more than it used to be - you used to have your SRS 'cooking manga' like Oishinbo and Cooking Papa, then some random shounen stuff like Yakitate Japan, Iron Wok Jan, Cooking Master Boy, Shoukugeki no Soma (Food Wars), Toriko... but they were all dedicated to cooking and food. Now it's just in any random manga.
I think it's mostly just because Japanese love food so much that everyone knows it's a cheap and popular way to pad things... and Isekai manga are kings of cheap padding. Like GipoScribantino said, Isekai was kind of leading the way there. But since Campfire Cooking was such a hit, now Isekai 'has' to have it since they all copy what sells. (I swear Isekai is overall less varied than actual porn.)