Yes indeed! Omega 3 fatty acids, which increase metabolic rates, can be used for weight loss. The right kind of fat can actually help you to lose weight! Omega 3 serves as building materials for series 3 prostaglandin, some of which help our kidneys get ride of excess water held in tissues. The excess weight of some overweight people is largely retained water (edema). Omega 3 helps to dump this water.
Omega 3 increases your metabolic rate, your oxidation rate, and your energy production. This effect begins to show up when enough of Omega 3 is taken. When your metabolic rate goes up, more fat and glucose are burned. Less fat deposition takes place.
Obesity is one of the top ten diseases related to an Omega 3 deficiency!