It's also a good idea to include plenty of oily fish or fish oil supplements in your daily diet
. The oil from these fish is rich in the omega-3 fatty acids EPA and DHA which are essential for the smooth functioning of the brain and nervous system. Some good sources are sardines, salmon, tuna, herring and mackerel. Some people just don't like fish or are worried about the contaminants found in fish. In this case, you would be better advised to take a daily dose of pharmaceutical grade fish oil supplement to be sure that you're getting these fatty acids without the danger of ingesting dangerous levels of PCBs, dioxin or mercury.