Oatmeal, Starbucks’ newest addition to its breakfast repertoire, has become a surprising success. According to an article from Advertising Age, the old-fashioned morning standby has become the Seattle-based chain’s biggest food launch success of all time.

The item, after just six weeks on the menu, has replaced reduced-calorie coffee cake as the chain’s best-selling food item.

That success comes in spite of warm September weather nationwide.

New figures show that the breakfast cereal is particularly popular with younger customers and women. Women are 6 percent more likely than men to order the cholesterol-reducing food.