  We discover that chiral symmetry does not act as an infrared attractor of the
renormalization group flow under the impact of quantum gravity fluctuations.
Thus, observationally viable quantum gravity models must respect chiral
symmetry. In our truncation, asymptotically safe gravity does, as a chiral
fixed point exists. A second non-chiral fixed point with massive fermions
provides a template for models with dark matter. This fixed point disappears
for more than 10 fermions, suggesting that an asymptotically safe ultraviolet
completion for the standard model plus gravity enforces chiral symmetry.
