The World's Healthiest Foods: Feeling Great

The World's Healthiest Foods: Feeling Great: "reduce the risk of becoming obese and improve the body's ability to respond to insulin by stimulating the secretion of leptin, a hormone that helps regulate food intake, body weight and metabolism, and is expressed primarily by adipocytes (fat cells) "

This article gives an overview of Omega 3 fatty acids and gives a chart of sources of this.