New research shows nearly 40 percent of cancers are preventable.Lia Hasier’s breast cancer diagnosis in 2022 was disorienting. She was not unhealthy before it, as she regularly prioritized exercise and healthy eating. So she became curious about what she might have been doing wrong and how she could prevent a recurrence. The 48-year-old mother of two now avoids all added sugar, chips away at exposure to cancer-causing chemicals, does daily gratitude journaling, and continues to learn about the ways her body works at the cellular level to prevent cancer. “There’s always room to make changes, but not all at one...