It's common knowledge that fish is low in calories and saturated fats, but eating fish isn't just good for your health -- it can also help you kick that persistent, depressive funk. Oily fish, such as mackerel, salmon, trout, tuna and eel, are fish that typically live near the surface of the sea. They're rich in omega-3 fatty acids, which play a crucial role in brain function, and have numerous mood-boosting benefits. In fact, one study found that daily doses of the omega-3 fatty acids found in oily fish were more effective at reducing typical depression symptoms, including sadness, insomnia, pessimism, lack of motivation and low libido, than many prescription antidepressants [source: Lawson].
However, oily fish aren't always straight swimmers, at least as far as your health is concerned -- they're often contaminated with environmental pollutants. Additionally, most oily fish are extremely high in mercury, which can be especially harmful to unborn children. In fact, the British government advises women of child-bearing age not to consume more than two servings of oily fish per week. However, oily fish are still important for developing infants in the womb -- the same governing body also stresses the importance of expectant mothers consuming fish several times a month [source: Food Standards Agency].
Oily fish can be baked, grilled or fried, and they can be eaten solo or served in salads or sandwiches.