  We present results concerning the light and strange quark contents of the
nucleon using $N_f=2+1+1$ flavours of maximally twisted mass fermions. The
corresponding $\sigma$-terms are casting light on the origin of the nucleon
mass and their values are important to interpret experimental data from direct
dark matter searches. We discuss our strategy to estimate systematic
uncertainties arising in our computations. Our preliminary results for the
$\sigma-$terms read $\sigma_{\pi N} = 37(2.6)(24.7) \mev$ and
$\sigma_s=28(8)(10) \mev$. We present our recent final analysis of the $y_N$
parameter and found $y_N=0.135(46)$ including
systematics\cite{Alexandrou:2013nda}.
