It seems like most foods have some kind of meat or fish extract in them.
Surprisingly a lot of foods contain some kind of meat or fish stock.
この場合、次のような言い方ができますよ。
ーIt seems like most foods have some kind of meat or fish extract in them.
「ほとんどの食品は何らかの肉か魚のエキスが入っているようだ」
meat or fish extract「肉か魚のエキス」
ーSurprisingly a lot of foods contain some kind of meat or fish stock.
「意外とたくさんの食品が何らかの肉か魚の出汁を含んでいる」
meat or fish stock「肉か魚の出汁」
ご参考まで!