Genes versus environment in cancer risk

William W. Li stresses environment, diet, and lifestyle drive most cancers; only 5–10% are genetic.

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You have around 10,000 cancer cells in your body right now, but most never become dangerous. The science suggests cancer risk is not just about genetics, but how your body responds to these cells. So what can you do, day to day, to support your body’s natural defences?

In this episode, Dr William Li, a world-renowned physician, scientist, speaker, and two-time NYT Bestselling author, explains how everyday foods can fuel cancer growth or help your body keep it under control. We explore how cancer starts, why it is part of normal biology, and explain why lifestyle and environment are more important than genetics when managing your cancer risk.

Dr Li shares simple guidance on eating patterns that support your body’s defences, including increasing plant-rich foods and reducing ultra-processed foods. He also highlights everyday habits such as staying active, supporting gut health, and limiting toxin exposure as ways to tip the balance in your favour.

If your body is already managing cancer cells every day, what small changes could help it do that job better?

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Timecodes

00:00 Intro

02:26 Almost everyone has microscopic tumours

08:15 We all have cancer right now?

10:45 Why most cancer cells stay harmless

13:40 The hidden trigger that fuels cancer growth

14:35 What makes cancer turn deadly

16:35 Cancer cells behave like seeds