Last reviewed 1 June 2026
Around 40% of cancers are linked to risk factors that better understanding and prevention can help address. Prevention does not mean guarantees — it means shifting the odds, choice by choice, in ways the evidence supports.
Tobacco remains the single largest preventable cause of cancer — there is no safe level of smoking. Alcohol increases the risk of several cancers; less is better. Food and weight: a diet rich in vegetables, fruit and fibre, and keeping a healthy weight, both lower risk — no single “superfood” does. Movement: regular physical activity has a protective effect of its own. Sun: most skin cancers are linked to UV exposure — shade, clothing and sunscreen genuinely help.
Prevention is not about blame, and it is not about fear. Many people who do everything “right” still develop cancer, and many risk factors — age, family history, chance — are not choices. The point of knowing the evidence is simply to act on what is in your hands, and to let go of guilt about what is not.
Pick one change you can keep, rather than five you cannot. The evidence favours consistency over intensity — and every step counts, at any age.
This guide is based on public guidance from European cancer institutes and public health authorities, written in plain language.
Common misconceptions about cancer, calmly and clearly corrected.
Which programmes exist, who they are for, and why timing can matter.
How to tell trustworthy sources from myths and sensational claims.
Words that help, questions to ask your doctor, and supporting someone close.
What cancer is, how it develops, and the words you will hear — in plain language.
