Food fads: Make mine gluten-full

When the federal government’s 1980 “Dietary Guidelines for Americans” warned about the baleful effects of saturated fats, public interest activists joined the fight and managed to persuade major food companies to switch to the shiny new alternative: trans fats.

Thirty-five years later, the Food and Drug Administration finally determined that trans fats are not just useless but unsafe, and ordered them removed from all foods. Oops.