Half a piece of cake?!

Listening to advanced weight loss exception video and Brooke said plan a half piece of cake. This blows my mind. I understand that is the intent. NO cake, I cake do. ALL the cake, I can do … but half a piece?! That immediatley brought up all kinds of discomfort for me. I guess i dont really have a question. I know its my job to figure out why this blows my mind. But sheesh. That just sounds like torture.