  A field theory is studied where the consistency condition of equations of
motion dictates strong correlation between states of "primordial" fermion
fields and local value of the dark energy. In regime of the fermion densities
typical for normal particle physics, the primordial fermions split into three
families identified with regular fermions. When fermion energy density is
comparable with dark energy density, the theory allows transition to new type
of states. The possibility of such Cosmo-Low Energy Physics (CLEP) states is
demonstrated in a model of FRW universe filled with homogeneous scalar field
and uniformly distributed nonrelativistic neutrinos. Neutrinos in CLEP state
are drawn into cosmological expansion by means of dynamically changing their
own parameters. One of the features of the fermions in CLEP state is that in
the late time universe their masses increase as $a^{3/2}$ ($a=a(t)$ is the
scale factor). The energy density of the cold dark matter consisting of
neutrinos in CLEP state scales as a sort of dark energy; this cold dark matter
possesses negative pressure and for the late time universe its equation of
state approaches that of the cosmological constant. The total energy density of
such universe is less than it would be in the universe free of fermionic matter
at all.
