patric,
No, you mis-read me. I think nuts are WONDERFUL for cholesterol numbers if eaten in "sensible" amounts. The only numbers that I worry about going up are the numbers on my bathroom scale from my very UNSENSIBLE amounts.
There's little doubt that walnuts will raise the HDL more than the LDL...unfortunately the effect MIGHT be to raise the total...not necessarily bad, but it will always get raised eyebrows from your GP.
My summary...an ounce a day is a GREAT snack

(a half-pound less great!

)