  A loop structure was predicted to exist in the Bloch bands of Bose-Einstein
condensates in optical lattices recently in [{\it Wu and Niu, Phys. Rev. A {\bf
61}, 023402 (2000)}]. We discuss how to detect experimentally the looped band
with an accelerating optical lattice through extensive and realistic numerical
simulations. We find that the loop can be detected through observing either
nonlinear Landau-Zener tunneling or destruction of Bloch oscillations.
