Home Health-Fitness A century ago, the American diet was rich in omega-3 fats from fish and grass-fed beef, and the rate of depression may have been 100 times lower than it is today. The shift from neurotransmitter-regulating omega-3s to a diet rife with omega-6 fats found in soybean, corn, safflower, and sunflower oils has drastically altered the nutrient balance in our brains. To increase #omega-3s, eat ground flax, flaxseed oil, or fish like #salmon several times a week.