In a seventy three days experimental period study. diets were prepared to
cause hypercholesterolemic rats. Linseed oil, a rich source of omega-3 fatty acids.
and olive oil. a rich source of mono-unsaturated fatty acids were used to study their
effect on serum total cholesterol and its fractions, High Density Lipo Protein (HDL),
Low Density Lipo Protein (LDL) and Very Low Density Lipo Protein (VLDL). In rats fed diets containing linseed oil, results showed decrease in the level of serum
total cholesterol. Such reduction is also most important as it was accompanied with         increase in HDL and decrease in LDL and VLDL.                                                       . On the other hand, rats fed diets containing olive oil showed no alteration on
total cholesterol, HDL, LDL and VLDL levels.