Final answer:
You should aim to start planning for food at a 3 on the hunger scale and stop eating at an 8 on the fullness scale.
Step-by-step explanation:
When it comes to honoring hunger on the hunger scale, you should aim to start planning for food when you are at a 3. This means that you are feeling hungry and should start thinking about eating. On the other hand, when it comes to honoring fullness on the fullness scale, you should aim to stop eating when you are at a 8. This means that you are feeling satisfied and comfortably full, but not overly stuffed.