Maintaining a low omega-6:omega-3 ratio (4:1 or lower, ideally 1:1) is also important in preventing health problems including heart disease, rheumatoid arthritis and cancer. [45] The SAD is closer to about 15:1 - 16.7:1. [46] The foods that throw this ratio off include most fish, most nuts and seeds, soy products, and almost all oils (which are highly processed); while most all fruit and vegetable