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Fish Oil may help fight against Type 2 diabetes

By: Pharma News | Views: 1594 | Date: 27-May-2013

Widely-used fish oil supplements modestly increase amounts of a hormone that is associated with lower risk of diabetes and heart disease, according to a study accepted for publication in The Endocrine Society's Journal of Clinical Endocrinology & Metabolism (JCEM).

Fish oil supplements may help fight against Type 2 diabetes



Fish oil supplements may help fight against Type 2 diabetes

Widely-used fish oil supplements modestly increase amounts of a hormone that is associated with lower risk of diabetes and heart disease, according to a study accepted for publication in The Endocrine Society's Journal of Clinical Endocrinology & Metabolism (JCEM).

Fish oil supplements, also called omega 3 fatty acid capsules, raise levels of adiponectin in the bloodstream. Adiponectin is an important hormone that has beneficial effects on metabolic processes like glucose regulation and the modulation of inflammation. In long-term human studies, higher levels of adiponectin are associated with lower risks of type 2 diabetes and coronary heart disease.

"While prior animal studies found fish oil increased circulating adiponectin, whether similar effects apply in humans is not established," said the study's lead author, Jason Wu, PhD, of the Harvard School of Public Health. "By reviewing evidence from existing randomized clinical trials, we found that fish oil supplementation caused modest increases in adiponectin in the blood of humans."

The meta-analysis reviewed and analyzed results from 14 randomized, placebo-controlled clinical trials. In total, 682 subjects were treated with fish oil, and 641 were given placebos - most commonly olive and sunflower oils. In those taking fish oil, adiponectin levels increased by 0.37 ug/mL. The results also suggested the effect of fish oil on adiponectin differed substantially across the trials, suggesting that fish oil supplementation may have stronger influence on adiponectin in some populations and weaker effects in others.

This is the first study to pool data from previous trials to suggest that fish oil consumption increases adiponectin in humans. The findings quantify the potential impact of fish oil on adiponectin level, and highlight the need to further investigate populations that may particularly benefit from fish oil supplementation.

"Although higher levels of adiponectin in the bloodstream have been linked to lower risk of diabetes and coronary heart disease, whether fish oil influences glucose metabolism and development of type 2 diabetes remains unclear," said Wu. "However, results from our study suggest that higher intake of fish oil may moderately increase blood level of adiponectin, and these results support potential benefits of fish oil consumption on glucose control and fat cell metabolism."

Despite the uncertainty about the effectiveness of fish oil on cardiovascular and metabolic diseases, many people take omega 3 fatty acids. Among the 17 percent of adults and 11 percent of children who take a natural product that is not a vitamin or mineral, more than a third of adults and nearly of third of children take fish oil, according to the 2007 National Health Interview Survey from the National Institutes of Health's National Center for Complementary and Alternative Medicine (NCCAM).

Other researchers working on the study include: L. Cahill and D. Mozaffarian of the Harvard School of Public Health in Boston, MA. The National Institutes of Health's National Heart, Lung and Blood Institute provided grants to support this work.

The article, "Effect of Fish Oil on Circulating Adiponectin: A Systematic Review and Meta-Analysis of Randomized Controlled Trials," appears in the June 2013 issue of JCEM
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