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We present an overview of modern approaches to low-energy baryon structurebased on baryon chiral perturbation theory. These are driven by the emergenceof Lorentz covariant schemes and the systematic consideration of the effects ofthe lowest-lying decuplet resonances. In order to illustrate the progressrecently achieved in this field, we present the last developments on ourunderstanding of the nucleon sigma terms along these lines. In particular, wewill show how these methods, in SU(2) or SU(3) settings, are reliable tools toprocess and maximize the information on the physical structure of the nucleonone can obtain from either experimental data or lattice QCD results.

Applications of baryon chiral perturbation theory. A topical example: The nucleon sigma terms