Omega 6 fatty acids are a class of polyunsaturated fats which have been growing in prevalence in modern diets. (1) Some research suggests that too many omega 6 fats can lead to an increased risk of cardiovascular disease, cancer, inflammatory, and autoimmune diseases. (2) This research is not conclusive, but for most people, the amount of omega 6 fats should be reduced and the amount of omega 3 fats should be increased.
Foods high in omega 6 fats include unhealthy foods like processed snacks, fast foods, cakes, fatty meats, and cured meats. Other Omega 6 foods are healthier including tofu, walnuts, and peanut butter. (3) Tofu and walnuts are even high in omega 3 fats and have a reasonable omega 3 to omega 6 ratio. The adequate daily intake (%AI) for Omega 6 foods is 17000mg per day. (4)
For more see the article of foods with the best omega 3 to 6 ratio, and the unfiltered list of over 200 foods high in omega 6 fats.