Ultra-processed food makes up 60 percent of the American diet. Though to call it food is a stretch. Because it is not, strictly speaking, food at all. It is an industrially produced edible substance. And it’s killing us. That is the nauseating conclusion Chris van Tulleken reaches in his new book, “Ultra-Processed People: The Science Behind Food That Isn’t Food.” Today, he explains how big businesses have corrupted our diets and what we can do to stop them from causing further harm.

In “Dopamine Nation: Finding Balance in the Age of Indulgence,” Dr. Anna Lembke says today’s superabundance of pleasurable stimuli makes us all vulnerable to overindulgence. But don’t lose hope. Anna, the medical director of addiction medicine at Stanford, says that by understanding how modern stimulants — from Instagram to masturbation machines — prey on our primitive brains, we can find ways to overcome the unhealthy dependencies that prevent us from leading balanced lives. (This episode originally aired in December 2021.) Host: Rufus Griscom Guest: Anna Lembke Executive Producer: Caleb Bissinger The Next Big Idea is produced in partnership with LinkedIn Presents