Darden Restaurants Inc. cut its forecast. It expects profit from continuing operations of 25 or 26 cents per share for the quarter ended Nov. 25. Not including one-time items, it expects 31 to 32 cents; by that measure, analysts had expected 46 cents. It also cut its full-year forecast, saying its promotions did not resonate with ‘‘financially stretched’’ diners and acknowledged bad publicity may have hurt it. Darden has made more workers part-timers to help limit its health care costs.