Fight ..Decreased Motivation  ..Procrastination  ..Forgetfulness  ..Mood swings with proper dopamine levels. And get it through these 9 foods, sunlight, and Amino acids, specifically L-tyrosine and Phenylalanine. Use food and/or supplements and see the difference when your levels are low. Too little can result in everything from Social Anxiety to Parkinson's. Having the Right Levels helps in decision making and high performance. Source of Energy for Neurotransmitters.