A cross-sectional study, published in the Iranian Journal of Nursing and Midwifery (2015 May-Jun;20(3):334-9) looked at the relationship between the consumption of omega-3 fatty acids and the frequency of migraine headaches. Earlier studies have shown that intake of omega-3 fatty acids improves migraine symptoms.
Subjects of the study were 105 migraine sufferers between the ages of 15 and 50. Researchers used a a semi-quantitative food frequency questionnaire. Frequency of migraine attacks during one month period was determined in all participants. They found that lower intake of omega-3 fatty acids was associated with a greater frequency of migraine headaches.