  We show that the evolutionary track of a low-mass red giant should make an
extended zigzag on the Hertzsprung-Russel diagram just after the bump
luminosity, if fast internal rotation and enhanced extra mixing in the
radiative zone bring the temperature gradient close to the adiabatic one. This
can explain both the location and peculiar surface chemical composition of
Li-rich K giants studied by Kumar, Reddy, & Lambert (2011). We also discuss a
striking resemblance between the photometric and composition peculiarities of
these stars and giant components of RS CVn binaries. We demonstrate that the
observationally constrained values of the temperature gradient in the Li-rich K
giants agree with the required rate of extra mixing only if the turbulence
which is believed to be responsible for this extra mixing is highly
anisotropic, with its associated transport coefficients in the horizontal
direction strongly dominating over those in the vertical direction.
