Just like it is traditional for Britons to have tea & cake, so is it traditional in America to have coffee & cake. It's through this tradition that coffee cake evolved; Instead of having the drink and food separately, they were combined into one. At first, it was actually coffee bread, as yeast was used, but eventually coffee made its way into sweeter treats as well, which helped offset the bitterness. Now coffee & walnut cake are a classic combination, and for good reason. It tastes great. Based on the brands I used, each slice is about 287 calories.