PRCC Public and Community Health Practice Exam

The choice indicating that approximately 33% of all cancer cases in the U.S. are related to nutrition and lack of physical activity is supported by numerous studies and public health data. Research demonstrates a significant link between lifestyle factors—such as diet and physical activity—and cancer risk.

Nutrition impacts the body's ability to maintain healthy cells and manage inflammation, while a lack of physical activity can lead to obesity, which is itself a risk factor for various types of cancer. In fact, organizations like the American Cancer Society have published findings highlighting how dietary choices, physical inactivity, and obesity contribute to cancer incidence. By addressing these risk factors through improved nutrition and regular exercise, a substantial portion of cancer cases could potentially be prevented, making the estimate around one-third quite plausible.

The other percentages, while they might touch on other risk factors or combine various causes, do not fully capture the extensive evidence highlighting the importance of nutrition and physical activity in reducing cancer risk.