Food list in Overeating workbook (Shannon)

Hi Brooke,
I hope this finds you doing amazing!
I noticed there are for lack of a better description, “serving sizes” next to the list of foods in the overeating workbook. What are these amounts for? Are these how much you recommend in a day? At one sitting? To get from -2 to +2?
Thanks for clarifying for me.
Have a beautiful Christmas!