TL;DR:
Higher omega-3 intake is consistently associated with lower levels of C-reactive protein (CRP), a marker of chronic inflammation linked to heart disease.
Omega-3 Fatty Acids and Inflammation
C-reactive protein (CRP) is a blood marker that rises when inflammation is present in the body. Persistently elevated CRP levels are associated with a higher risk of heart attack and stroke and are commonly used as an indicator of chronic, low-grade inflammation.
Several studies have examined the relationship between omega-3 fatty acids and CRP levels. Research published in the European Journal of Clinical Nutrition. (2009;63:1154–1156) evaluated omega-3 status and CRP levels in 124 adults and found an inverse relationship—individuals with higher omega-3 levels tended to have lower CRP.
Larger population studies report similar findings. A study published in Atherosclerosis (201, no. 1, November 2008, pages 184–191) examined dietary omega-3 intake and CRP levels in more than 14,000 adults aged 40 to 69. Higher omega-3 consumption was associated with lower CRP levels, with the relationship appearing strongest in higher-risk groups such as male smokers.
Comparable results have been reported in other cohorts. Studies published in the American Journal of Clinical Nutrition (2006; 84(1):223–229) and Nutritional Research (2008; 28(5):309–314) found that higher omega-3 intake was associated with lower CRP concentrations.
Taken together, these findings are consistent with a broader body of research linking omega-3 fatty acids with inflammatory pathways. Because CRP reflects sustained, low-grade inflammation, it is biologically plausible that higher omega-3 intake may support lower inflammatory burden. However, most of these studies are observational and describe associations rather than direct cause-and-effect relationships.
Of course, there are other essential fatty acids and they can play a role in reducing inflammation.
