> this will sound super unscientific (because it is) but I've always wondered if the body (or life in general) relies upon any unknown/undiscovered physical phenomena.

I strongly disagree that creatively speculating about the possible limits of our knowledge is unscientific. This type of thinking is essential for scientific discovery. The attitude that you are referencing is scientism, which is an irrational (and non-scientific) over-confidence in the power of our existing knowledge and authority figures in scientific fields.

Indeed, much of the mechanisms behind life remain a mystery, and could very well involve undiscovered physics. There's no way for us to know yet how much physics remains undiscovered. What if there are phenomena as important and fundamental as say, electricity that remains to be discovered? To me, as a researcher in biotech, I wouldn't be so surprised by such a thing, because of how frustratingly unpredictable living systems are... it would be fully consistent with what we see to have something really really big that we've been missing all along.