Stress hormones have an archenemy: omega-3 fatty acids. A 2003 study from Diabetes & Metabolism found that a diet rich in omega-3 fatty acids kept cortisol and adrenaline from geysering. Omega-3 fatty acids also protect against heart disease, according to a 2002 study in the Journal of the American Medical Association. “Eat an 85g serving of fish, especially fatty fish like salmon, mackerel, herring and light tuna, at least twice a week,” Jamieson-Petonic says. Not a fish eater? For another omega-3 punch, buy foods fortified with DHA (you’ll find this particular fatty acid in eggs, yoghurt, milk and soy products); but don’t go out of your way for products that boast booming levels of ALA, another fatty acid, which may not work as well.