In this paper, we consider a generic hidden sector which interacts only gravitationally with Standard Model particles. We show that quantum gravity leads to operators which can be probed with fifth force type experiments. The E?t-Wash torsion pendulum experiment implies that the masses of any scalar field or any massive spin-2 field that couples with the usual gravitational strength to the energy-momentum tensor of the Standard Model must be larger than10?3eV. This has interesting consequences for models of dark matter which posit very light scalar fields. Dark matter must be heavier than10?3eV if it is a scalar field or a massive spin-2 field.
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