It gets trickier. Omega-3 has two primary components, called EPA and DHA (not to be confused with DHEA).
DHA is the component associated with its anti-inflammatory action. EPA is actually slightly inflammatory.
Ideally, it has been suggested that most people get too much Omega-6, which is balanced with Omega-3. There is also Omega-9, but it can be created by the body from unsaturated fats.
Another twist is a recent therapy has been developed for children suffering from severe, non-responsive juvenile epilepsy. The therapy is an extremely high-fat diet, with some protein but very little carbohydrate. In some of these children, by diet alone, they have gone from hundreds of seizures a day to just two or three.
Hemp oil? It seems to help.