For those of you used to hearing how wonderful fish oils are for everything, researchers are beginning to discover that, like anything, fish oils are at times appropriate and at times not so appropriate. In Chinese dietary therapy fish is forbidden anytime someone has a bronchial infection. However, until recently there was no hard evidence that this was in fact a valid concern.
In this recent study, they took a group of mice and gave them the flu. They then fed some of the mice fish oils and others served as a control group and only ate their regular diets. The researchers found the fish oil fed mice had much lower levels of inflammation in their lungs than the control mice. However, the fish oil fed mice had a 40% higher mortality rate than the controls. That means you may be much more likely to die from the flu if you take fish oils.
J Nutr. 2009 Aug;139(8):1588-94. Epub 2009 Jun 23.
I don’t think one can make the connection that eating fish oils while infected with the flu will increase one’s risk of dying. This study was an animal study using mice, not humans, so one cannot make a correlation drawn from this study other that mice had a higher mortality rate.
While I agree that we need to be cautious in interpreting animal studies in humans, the fact of the matter is fish have been contraindicated in Chinese Medicine during any kind of bronchial infection for centuries. Chinese Medicine research is human based and very long term (centuries to millenia of observation).
Also, the physiological mechanisms are completely applicable to humans. Dr. Matt Van Benschoten also commented that earlier studies showed fish oils impaired production of gamma-interferon and virus specific IgA. Lastly, as we are all aware by now, many scientists and public health officials are worried that the H1N1 could come around again in a very deadly form. If it does, then we are indeed talking about lowering one’s risk of dying and it would seem that skipping on the fish oils if you get the flu or around people with the flu might be prudent.