Harrelsons Own CBD Even, fish are very good at accelerated weight loss. There are Omega-3 fatty acids in fish, such as salmon and tuna. Omega-3 fatty acids fall within the 'good fat' or unsaturated fat category. Due to a hormone called leptin that stores fat inside your body, you have gained weight. Omega-3 fatty acids will cut back on leptin; you are bound to lose weight when it happens!