Comment by unwind

The sugar content didn't look so bad to me, but I found the table in the upper left corner humorous:

    Recommended Pizza Serving Sizes:
    ------------------+-------------
                      |    Small
    ------------------+-------------
    Thin crust        |  1/4 pizza
    Hand Tossed       |  1/6 pizza
    Deep Dish         |     n/a
    Brooklyn          |     n/a

How can the "recommended serving size" (aka "portion size", right?) be not applicable? Are they telling me it's not fit for consumption? Pretty sure I'm not getting it, not a native speaker, etc.