The FDA is only banning artificially produced trans fats.
You'd be surprised - to meet the FDA's labeling guidelines, a food must simply have less than 0.5g of trans fats per serving. Girl Scout cookies meet that expectation, but there are still some that contain levels of trans fat. The bigger issue seems to be that we're trading one harmful substance for another: palm oil is usually the go-to replacement in the industry, but that has been shown to have the same effects on cholesterol and health as the trans fats!
The research into dietary fat is a curious intersection of politics, profit, government and science. Studies have shown that if all saturated fats were eliminated from diet, a healthy non-smoker could expect between 3 days and 3 months longer life.[1] There are many other dietary factors, such as the consumption of green vegetables and fiber that have a far greater magnitude of impact on life span and health. Americans seem to have latched onto fat as being some sort of puritan evil in the diet. If you don't eat one thing, you'll eat another--so now diets are laden with carbs. What effect is that having? We live in the omnivore's dilemma.[2] In short, the last 50 years of messaging on fat in diet are proving to be based on faulty science.[3] [1] http://garytaubes.com/wp-content/uploads/2011/08/Science-The-soft-science-of-dietary-fat.pdf [2] Michael Pollan, The Omnivore's Dilemma: A Natural History of Four Meals, ISBN-13: 978-1594132056 [3] http://www.wsj.com/articles/SB10001424052702303678404579533760760481486