  Dependence of the confinement transition parameters on the fermion content
provides information on the mechanism of confinement. Recent progress in
lattice gauge theories has allowed to study it for light flavor number $N_f\sim
O(10)$ and found this transition to shift toward significantly stronger
coupling. We propose an explanation for that: light fermions can occupy the
chromo-magnetic monopoles, via zero modes, making them "distinguishable" and
unsuitable for Bose-Einstein Condensation. Such dilution of unoccuplied
monopoles is compensated by stronger coupling that makes them lighter and more
numerous. We also suggest that flavor-carrying quark-monopole objects account
for the density beyond quark Fermi sphere seen in cold dense phase of $N_c=2$
lattice QCD.
