  We examine the relationship between quantum contextuality (in both the
standard Kochen-Specker sense and in the generalised sense proposed by
Spekkens) and models of quantum theory in which the quantum state is maximally
epistemic. We find that preparation noncontextual models must be maximally
epistemic, and these in turn must be Kochen-Specker noncontextual. This implies
that the Kochen-Specker theorem is sufficient to establish both the
impossibility of maximally epistemic models and the impossibility of
preparation noncontextual models. The implication from preparation
noncontextual to maximally epistemic then also yields a proof of Bell's theorem
from an EPR-like argument.
