When it comes to cancer prevention Omega-3 fatty acids from fish pack a stronger punch than flaxseed and other oils new research has found. Marine-based omega-3s are eight times more effective at inhibiting tumour development and growth than plant-based sources said the study published in the Journal of Nutritional Biochemistry. This study is the first to compare the cancer-fighting potency of plant-versus marine-derived Omega-3s on breast tumour development said David Ma Professor at University of Guelph in Ontario. There is evidence that both Omega-3s from plants and marine sources are protective against cancer and we wanted to determine which form