A new review-of-the-research report published in the December '06 American Journal of Clinical Nutrition finds that the benefits of fatty acids (omega-3 polyunsaturated fatty acids, found in fish oil) for treating depression relief remain unclear.

Their conclusion: The research done in this area isn't extensive enough to draw any certainties from. Larger studies are needed. And more of them.

Here's a summary of the findings from Reuters Health.