Henny,
That depends on who you talk to...for the most part, the research I've seen shows that raw nuts contain more nutrients than toasted. But the toasted nuts are still good for you. One exception to this - per my homeopath - is almonds. He says that sometimes it's harder for the body to use the nutrients in raw almonds.
To be on the safe side - if you toast them, do so only lightly. Do not add oil.
Lisa
http://www.pinkkitchen.info