Is Oishinbo hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 1988 · 136 episodes · PG-13 - Teens 13 or older
Drama, Gourmet, Seinen
Oishinbo is a drama about newspaper reporters. The main character is a cynical food critic named Yamaoka. Oishinbo is a popular mainstream comic for adults in Japan. It is even mentioned in an episode of "Iron Chef." (Source: AniDB)
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