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Omega-3 fatty acids provide a lot of energy for the brain, Werner-Gray says. Two crucial ones -- EPA and DHA -- are primarily found in certain fish. The Omega 3s that are not converted to EPA or DHA remains inactive and are simply stored or used as energy. Foods that are high in Omega 3s include salmon, chia seeds, walnuts, oysters, tuna, soybeans, anchovies.