The typical Western diet contains too much omega-6 and too little omega-3 fatty acids. To change that balance, try to swap some foods in the first category for those in the second.
Corn, sunflower, safflower, cottonseed, and soybean oils
Most commercial baked products
Fatty fish such as salmon, albacore tuna, mackerel, and sardines
Green, leafy vegetables
Olive, canola, flaxseed, and walnut oils