> You could host a dinner party with eight people at the table speaking eight different languages, and the voice in your ear will always be whispering the one language you want to hear. And at this hypothetical dinner party, what would the earpieces whisper in English (or most other languages) when the Japanese guests said いただきます? Some words just don't have a translation in other languages. https://www.google.com/sea…
«Bon appétit» would be an adequate translation for most English speakers (even though it's French). A more "pure" English translation would probably be a grace of some kind, which serves more or less the same purpose (although I can also see some atheists bristling at a grace where they wouldn't bristle at いただきます or bon appétit).
The question isn't, "How do you say いただきます in English." The better question is, "Do English speakers have a set phrase they say right before eating." And the answer is no they don't.