Fast food chains have expanded across the United States in recent decades, putting more nutrient-lacking and calorie-dense food into American diets. To help explain the nation’s growing dependence on this “junk food,” researchers at Boston University and Tufts University examined how fast food menus have changed over the past 30 years.

March Forward Massachusetts, a nonprofit formed by the organizers of the Boston Women’s March For America, announced its first official action as an organization to sponsor Bill S.365, “An Act...