For those who may not know, Kippers are split, smoked, salted herring. Herring are high in omega-3 fatty acids and vitamin D. You may want to limit the amount of Kippers if from larger Herring, as they may contribute a greater amount of mercury or PCB's (an environmental contaminant). Sardines are also high in omega-3 fatty acids and vitamin D. Since they are much smaller fish, they contribute much less mercury to the diet. So then, which is better? I would say go with the canned sardines. You have a lower exposure to mercury and less salt as well. Throwing in some Kippers once in a while won't be the end of the world though.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.