The hypothetical dark matter and dark energy play the role of sources of gravity, supplementing what General Relativity predicts based on the observed masses in the Universe.This brief note accounts for this additional G-force / potential based on the Theory of Gravity of quantum origin, emerging from the quark structure of matter.This supplemental gravity is due to the presence of fractional charges of quarks, which yield different interaction strengths depending on the polarization of spin directions of neutrons and protons. In the presence of high intensity magnetic fields of rotating systems (neutron stars, galaxies etc.) the change in polarization of spins affects the intensity of the gravitational field. Note that such a dependence cannot be accounted for my GR via only the metric of space-time.This is consistent with theories of Modified Gravity on fiber bundles, including spin for instance, as effective theories of Gravity without black matter and black energy.