Despite everything you've said about not feeling fine, it seems like you're eating quite well.
ご質問ありがとうございます。
「なんだかんだいいながら[よく食べる](https://eikaiwa.dmm.com/uknow/questions/133179/)じゃない」は英語で「Despite everything you've said about not feeling fine, it seems like you're eating quite well.」と言えます。
ご参考になれば幸いです。
You seem to be eating quite well for someone who doesn't have an appetite.
この場合、次のような言い方ができますよ。
ーYou seem to be eating quite well for someone who doesn't have an appetite.
「食欲ない割にはかなりよく食べてるね」
to eat well「よく食べる」
appetite「食欲」
ご参考まで！
アメリカ合衆国 
カナダ 
