Many nuts are monounsaturated. That's the kind of fat you find in olive oil. Monounsaturated nuts include almonds, hazelnuts, and some other nuts, while a few are polyunsaturated, like walnuts. All the studies that have been done with nuts have confirmed the fat in nuts are good fats, because they lower blood cholesterol. They lower bad cholesterol, but not the good cholesterol.
Unsaturated fats are usually good.
So you want to limit the saturated fats, but still need some fat in the diet. The answer to that is something like nuts. The unsaturated fats in nuts are poly- or monounsaturated as we already said. When they replace the saturated fat of animal products, they lower cholesterol. There is no doubt about it.