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Dear Mark: Omega-3s and Fish Allergies
Posted By Mark Sisson On February 22, 2010 @ 8:48 am In Dear Mark,Fat | 57 Comments
By now we all know the benefits of fish oil  and its omega-3s : lower risk of heart disease, stroke and cancer, less systemic inflammation, lower risk for depression, better skin, and so on. Although fish  and fish oil  supplements are the best sources for these omega-3  benefits, there are nonetheless scenarios that rule out these sources.
I’m sold on the benefits of a Fish Oil Supplement and I’m interested to start taking one. However, I have had serious allergic reactions to Shell Fish in the past, and an allergist has shown me to be reactive to most fish in general. As such I have avoided anything and everything that swims for a very long time. Maybe it’s possible my allergies were due to inflammation caused by my CW diet, but I’m still wary to test my theory now that I’m eating Primal. I feel like I’m missing out on a huge variety of food and supplement options. Question: I know anything can cause an allergic reaction, but is there any scientific basis for Fish Oil Supplements causing allergic reactions in people who have demonstrated allergies to fish/shellfish? And if so, what are my options for proper Omega-3 supplementation?
Thanks to DJK for this week’s question. First, let me expand on the allergy subject. Fish allergies are most commonly set off by fish proteins and less commonly by fish bones and skin (found in gelatin products). Even if you’ve shown a sensitivity to finned fish, you don’t need to rule out fish oil just yet. Although processing varies considerably between brands, true purified fish oil shouldn’t contain anything that would incite an allergic reaction. For those with a sensitivity but not full-blown allergy to fish, I’d recommend giving a high quality purified supplement a careful but fair try. A very small study  showed that purified fish oil supplements were safe for those with fish sensitivities.
If, on the other hand, you’re one of the few with a serious, life-threatening allergy to fish I’d recommend a different omega-3  route. Your best bet is to come at it from multiple angles.
Thanks for reading everyone, and be sure to weigh in with your thoughts for DJK. As always, thanks for all your great questions and comments, and keep em’ coming!
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 fish oil: http://www.marksdailyapple.com/fish-oil-questions-dosage/
 omega-3: http://www.marksdailyapple.com/omega-3-dosage-sources/
 study: http://www.ncbi.nlm.nih.gov/pubmed/18926060
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 better omega ratio: http://www.eatwild.com/healthbenefits.htm
 body’s conversion of ALA to EPA and especially DHA is limited: http://lpi.oregonstate.edu/infocenter/othernuts/omega3fa/#metabolism
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