I don't think it is in princible impossible to find objective moral values hardwired in our brains that makes us uncomfortable when we do things that is not good for ourselves, or our families, or society.
But if it's a mechanism of our bodies, while it might be "objective" in the sense that it's a physical thing, it's still relative to each human. Just like someone is born tall or bow-legged, one might be born with 'wires' that make them uncomfortable with different things. If they act accordingly, are they moral? Even if what they do makes most others uncomfortable?