  I show that if the total energy of a system of interacting particles may be
written as a sum of quasiparticle energies, then the system of quasiparticles
can be viewed in general as an ideal gas with fractional exclusion statistics
(FES). The general method for calculating the FES parameters is also provided.
  The interacting particle system cannot be described as an ideal gas of Bose
and Fermi quasiparticles except in trivial situations.
