Salmon is a super-nutritious food that can work miracles on your body. It’s high in omega-3 fatty acids that increase happy brain chemicals such as serotonin and help regulate stress hormones such as adrenaline and cortisol. Moreover, omega-3 fatty acids help improve your brain function. Try eating 2 to 3 servings of salmon per week to reduce your stress levels. If you don’t like salmon, opt for another oily fish like sardines, tuna and mackerel.