The National Institutes of Health (NIH) states that depression can be caused by a deficit of omega 3; omega 3 fatty acids are essential fatty acids that cannot be produced by the body. Increasing the amount of omega 3 fatty acids, either through food or supplements, can reduce depression symptoms. The University of Maryland Medical Center notes that depression patients who are omega 3-rich fish two to three times a week over five years had a decrease in depression symptoms.
Fish Products
Fish are a superb source of omega 3 fatty acids, according to the University of Maryland Medical Center and the George Mateljan Foundation. Salmon is the best source, receiving an "excellent" rating from the George Mateljan Foundation. Other fish, like halibut, shrimp, cod, snapper, scallops and tuna, received a "good" rating.
Vegetarian Products
Omega 3 fatty acids are also found in fruits, vegetables, herbs, soy products, nuts and seeds. Flaxseeds and walnuts received an "excellent" rating from the George Mateljan Foundation. A "very good" rating was given to cloves, oregano, cauliflower, mustard seeds, cabbage and broccoli. Romaine lettuce, brussel sprouts, winter squash, summer squash, tofu, collard greens, spinach, kale, soybeans, strawberries, green beans, raspberries, miso and turnips received a "good" rating.
Supplements
Omega 3 fatty acid supplements are another option if food products do not provide enough, or if the patient has a restricted diet. Omega 3 supplements are available as soft gels and bottled liquids.
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