  The ALICE experiment has been taking data since 2009, with proton and lead
beams. In this paper, the different particle identification techniques used by
the experiment are briefly reviewed. The current results on identified particle
spectra in pp collisions at $\sqrt{s} = 900 \mathrm{GeV}$ and 7 TeV, and in
Pb-Pb collisions at $\snn = 2.76 \mathrm{TeV}$ are summarized. In particular,
the energy dependence of the spectral shapes and particle ratios in pp
collisions is discussed and the results are compared to previous experiments
and commonly used Monte Carlo models. The baryon/meson ratio $\Lambda/K^0_S$ is
studied in Pb-Pb collisions as a function of transverse momentum and
centrality, and it is compared to previous results. The evolution of the
particle spectra in Pb-Pb with collision centrality is compared to measurements
at lower energies and discussed in the context of thermal and hydrodynamical
models.
