Omega-3 and omega-6 are essential fatty acids your body can't make, so you must get them from food. Omega-6 (LA) aids clotting and immunity, while omega-3 (ALA) supports brain and heart health—but converts poorly to EPA/DHA, which are mainly in fish. Too much omega-6, especially from seed oils, can fuel chronic inflammation. Balance is key—aim for more omega-3s, fewer processed oils, and know that even carnivore diets can meet essential fat needs.