In "The Glass Castle" by Jeannette Walls, a striking warning is highlighted regarding the dangers of consuming polar bear liver. Due to its high concentration of vitamin A, ingesting this organ can lead to serious health risks, including toxicity. This serves as a cautionary tale about the importance of being aware of the foods we consume and their potential effects on our bodies.

This lesson reflects broader themes in the book about survival and making informed choices. Walls shares her childhood experiences, often characterized by neglect and hardship, while illustrating how understanding our environment and its hazards is crucial for our well-being. The mention of polar bear liver underscores the significance of knowledge in navigating challenges in life.