This document discusses the importance of understanding what students already know about a topic (K), what the teacher wants them to learn (W), and what they will have learned by the end of a unit (L). It provides an example applying this K-W-L framework to a unit on healthy eating. According to the document, by the end of the unit students will have learned about balancing different food groups in a weekly diet, eating a variety of fruits and vegetables daily, and other healthy habits beyond diet like sleep, rest, and hygiene.