The processes by which 'normal' oils are extracted (high-speed presses or in some cases IIRC solvents) use high temperatures which can destroy some of the nutrient content (Omega oils &c.); cold-pressed oils have more of these nutrients. They also usually have a stronger/more complex taste, which may make them better for dressings, salads, etc.
The processes by which 'normal' oils are extracted (high-speed presses or in some cases IIRC solvents) use high temperatures which can destroy some of the nutrient content (Omega oils &c.); cold-pressed oils have more of these nutrients. They also usually have a stronger/more complex taste, which may make them better for dressings, salads, etc.