  We study the impact of quantum gravity on a system of chiral fermions that
are charged under an Abelian gauge group. Under the impact of quantum gravity,
a finite value of the gauge coupling could be generated and in turn drive
four-fermion interactions to criticality. We find indications that the
gravity-gauge-fermion interplay protects the lightness of fermions for a large
enough number of fermions. On the other hand, for a smaller number of fermions,
chiral symmetry may be broken, which would be in tension with the observation
of light fermions.
