I'm so not sure! I never did the Core program and now the Core and Flex program have been merged into one. The question you have is apparently the reason why the Core program was ceased, according to my leader. People were apparently overeating and not getting the results they wanted because of the difficulty of personally assessing the 2-3-4 part of the scale -- they were hungry (0) and ate to full (5), and the 2-3-4 was hard to define.
Hope you get a better answer than THIS!!!