  Deep inelastic scattering (DIS) of charged leptons off scalar mesons in the
$1/N$ expansion is studied by using the gauge/gravity duality. We focus on the
D3D7-brane system and investigate the corresponding structure functions by
considering both the high energy limit and the $1/N$ expansion. These limits do
not commute. From the D7-brane DBI action we derive a Lagrangian at sub-leading
order in the D7-brane fluctuations and obtain a number of interactions some of
which become relevant for two-hadron final-state DIS. By considering first the
high energy limit followed by the large $N$ one, our results fit lattice QCD
data within $1.27\%$ for the first three moments of $F_2$ for the lightest
pseudoscalar meson.
