Nutrition and Cancer

"Few words frighten like 'cancer,' and few questions follow a diagnosis faster than 'What should I eat?' The honest answer is neither of the two stories the internet tells. Food did not single-handedly give you cancer, and no food will cure it. But across a lifetime, what we eat, drink, weigh, and how we move genuinely shapes the risk of ever getting many cancers — and once cancer is being treated, good nutrition is one of the quiet things that helps a body endure it. This book is about that honest, hopeful middle."

Cancer is among the most common and most feared diagnoses in human health. Worldwide, it is a leading cause of death — roughly one in five people will develop cancer in their lifetime, and it accounts for close to 10 million deaths a year (Sung et al., 2021). Almost everyone has either faced cancer or loved someone who has. Understandably, a diagnosis — or simply the wish to avoid one — sends people searching for answers, and the loudest answers are often about food: anti-cancer "superfoods," sugar that supposedly "feeds" tumors, alkaline diets, juice cleanses, and a thousand supplements promising protection or cure.

This book is an honest, evidence-based guide to the relationship between nutrition and cancer — what diet genuinely does for cancer risk, what it does (and doesn't do) during treatment, what helps in survivorship, and how to navigate a field crowded with both fear and false hope. It is written for everyone: whether you want to lower your risk, you have a diagnosis, you support someone who does, you coach or teach, or you work in a health field and want a rigorous, myth-busting account.

A grounding truth shapes everything that follows:

Diet meaningfully affects the risk of developing many cancers, and good nutrition genuinely supports people through treatment and survivorship — but no food, diet, or supplement cures or "starves" cancer. Nutrition is a powerful lever for prevention at the population level, and a valuable complement to medical care once cancer is present — never a substitute for it (this is Book N4 in the library's scope-of-practice framework). This is not a "beat cancer with food" book, and it is not a "diet is irrelevant" book. It is an honest map of where nutrition truly matters.