McDonald's has agreed to pay $8.5 million (€6.6 million pounds) to settle a lawsuit over artery-clogging trans fats in its cooking oils.
McDonald's said it will donate $7 million to the American Heart Association and spend another $1.5 million to inform the public of its trans fat plans.
The settlement is the result of litigation from a San Francisco area activist who has been seeking to raise public awareness of the health dangers from the trans fatty acids (TFAs) in hydrogenated or partially hydrogenated oils.
Trans fats are used in thousands of processed food products, often giving the crunch to French fries, cookies, and cereals.
They are created in processing vegetable oils and have been found to be as unhealthy as pure cholesterol. The latest official US nutrition recommendations suggest limiting their intake.
"McDonald's has reached an agreement to further notify our customers about the status of our ongoing initiative to reduce TFAs in our cooking oil," the company said in a statement.
"McDonald's has been successful in reducing TFA levels in our Chicken McNuggets, Crispy Chicken Sandwich and McChicken Sandwich," the fast food firm said. "McDonald's continues to work hard on our initiative to reduce TFAs in our cooking oil."
Mr Stephen Joseph, a lawyer who founded BanTransFats.com, sued McDonald's over complaints the firm did not properly inform the public that it had encountered delays in plans to lessen the trans fats in its cooking oils.
British-born Joseph first gained publicity for his cause by suing Kraft Foods two years ago to highlight the trans fat content of Oreo cookies. The company has since moved to remove trans fats from its snack foods.
"While there is a difference of opinion regarding whether McDonald's gave effective notice to its customers that the oil was not changed, McDonald's deserves recognition and credit for having achieved a reduction in the trans fat levels in its chicken products and for working diligently over the last two years to test additional cooking oils," Mr Joseph said in a statement.