Food author Michael Pollan has long warned about inexpensive, factory-processed food. He says many of these foods have been stripped of fiber, which makes us not feel as full and want to eat more. In his 2009 bestselling book, "Food Rules: An Eater's Manual,” Pollan offered tips for maintaining a healthier diet. His No. 1 rule: "Eat food. Not too much. Mostly plants." #ultraprocessedfood #health #michaelpollan #nutrition