  It has been argued that the leading scalar-isoscalar WIMP-nucleus
interactions receive parametrically enhanced contributions in the context of
nuclear effective field theories. These contributions arise from meson-exchange
currents (MECs) and potentially modify the impulse approximation estimates of
these interactions by 10--60%. We point out that these MECs also contribute to
the quark mass dependence of nuclear binding energies, that is, nuclear
\sigma-terms. In this work, we use recent lattice QCD calculations of the
binding energies of the deuteron, He-3 and He-4 at pion masses near 500 MeV and
800 MeV, combined with the experimentally determined binding energies at the
physical point, to provide approximate determinations of the \sigma-terms for
these light nuclei. For each nucleus, we find that the deviation of the
corresponding nuclear \sigma-term from the single-nucleon estimate is at the
few percent level, in conflict with the conjectured enhancement. As a
consequence, lattice QCD calculations currently indicate that the cross
sections for scalar-isoscalar WIMP-nucleus interactions arising from
fundamental WIMP interactions with quarks do not suffer from significant
uncertainties due to enhanced meson-exchange currents.
