12 Fish Oil Substitutes for Vegetarians Fish oil is high in demand nowadays because it contains high amounts of omega-3 fatty acids (also called as essential fatty acids), required in every level of cellular and body functions. A deficiency of essential fatty acids serves as an open invitation for life-threatening disorders such as stroke, heart disease, and diabetes. The thing with omega-3 fatty acids is that these polyunsaturated fats are required to keep the vital organs such as heart, joints,…