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Fits of the p^4 covariant SU(2) baryon chiral perturbation theory to latticeQCD nucleon mass data from several collaborations for 2 and 2+1 flavors arepresented. We consider contributions from explicit Delta(1232) degrees offreedom, finite volume and finite spacing corrections. We emphasize here ourNf=2+1 study. We obtain low-energy constants of natural size that arecompatible with the rather linear pion-mass dependence of the nucleon massobserved in lattice QCD. We report a value for the pion-nucleon sigma term of41(5)(4) MeV for the 2 flavor case and 52(3)(8) MeV for 2+1 flavors.

The nucleon mass and pion-nucleon sigma term from a chiral analysis of Nf = 2+1 lattice QCD world data