Listverse's article 10 Unhealthy Foods You Think are Healthy claims:
Nuts are generally healthy. Most sorts come packed with vitamins, minerals, fiber, and lots of goodies for your body to enjoy. Peanuts is not a horrible exception, but it might not be as good as other kinds of nuts. The majority of peanuts sold as snacks come packed with salt, and they are often roasted and come coated in unhealthy fats. But the nuts themselves are healthy, you say? Well, maybe. Of course they have the before mentioned benefits of containing a lot of vitamins and minerals, but they contain A LOT of the kind of unsaturated fatty acids known as omega-6 fatty acids. You might have heard about it before, along with the omega-3 acids.
It is a scientific fact that a food intake with a too distorted omega 6:omega 3 ratio (in favor of the omega 6 version), increases the risk for many common diseases, like diabetes and Alzheimer’s. The ratio SHOULD be 1:1, but the American diet ranges between 1:20 and 1:50, in favor of the omega 6. Maybe I shouldn’t go as far as to say peanuts are bad for you, but they should be consumed in a limited quantity, and they should be eaten as nature made them – raw and without added salt.