In Margaret Atwood's novel "Cat's Eye," the protagonist reflects on the paradoxes of health and lifestyle choices. She mentions her experience with jogging, noting that although it's often seen as a healthy activity, it can have detrimental effects on one’s knees. This illustrates the idea that what is generally considered good for health can sometimes lead to negative consequences.

Furthermore, the character highlights the dangers of overconsumption of certain nutrients, such as beta carotene and calcium, linking them to unusual side effects like turning orange or developing kidney stones. This commentary underscores the complexities of striving for health, suggesting that the pursuit of wellness can sometimes have harmful outcomes, emphasizing that even well-intentioned actions can lead to unexpected issues.