Once ubiquitous in everything from frozen pizza to coffee creamer to popcorn, artificial trans fats are – as of Monday – banished from U.S. restaurants and grocery stores. Food-makers have had three years to phase out the ingredient, which the Food and Drug Administration ruled unsafe to eat in 2015. Nutrition researchers and public health advocates long ago found artificial trans fats, a modified form of vegetable oil, raised “bad” cholesterol and contributed to heart disease. That prompted a wave of voluntary recipe changes at food companies, and trans fat consumption has plummeted over the past decade.