In one study, researchers tested a theory that omega-3s would raise levels of adiponectin, a hormone released by fat cells that promotes insulin sensitivity—the ability of the body to use insulin to efficiently metabolize sugar.
In the study, 50 overweight but otherwise healthy people took 1,100 mg of omega-3 fish oil per day, or an olive oil placebo. After six weeks, while there was no change for the placebo group, the omega-3 group saw a small but significant increase in adiponectin levels.
Researchers said the positive results from this short-term, low-dose trial suggest longer term studies to test for the anti-inflammatory effects of omega-3 fish oils and to find the best dose.