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Summary
On episode 254 of 40+ Fitness, Coach Allan sits down with Dr. Richard Beliveau, director of the Molecular Medicine Laboratory and a researcher in the Department of Neurosurgery at Notre Dame Hospital, and holder of the Claude Bertrand Chair at the University of Montreal Hospital, to discuss his book Foods to Fight Cancer.
Richard argues that most cancer risk is not hereditary at all. Smoking accounts for about 30% of cancer deaths, obesity and diet another 30%, while alcohol, stress, pollution, and heredity combined only add up to a small fraction. Precancerous mutations show up in most of us by the end of childhood, and it is decades of lifestyle choices, not bad luck, that decide whether those cells ever become a clinically relevant cancer.
The conversation covers the World Cancer Research Fund’s 10 lifestyle recommendations, what phytochemicals actually are and why they are not the same as antioxidants, and a randomized study showing the Mediterranean diet cut breast cancer risk by 70%.
Links
- https://richardbeliveau.org
Key Takeaways
- Cancer is a genetic disease, but rarely a hereditary one. Cancer is caused by mutated genes, but very few of those mutations are passed down from parents. Richard draws a hard line between “genetic” and “hereditary” to correct a common misconception that family history is the main driver of cancer risk.
- Smoking and obesity/diet are the two real enemies, each responsible for about 30% of cancer deaths. Every other named risk factor, including alcohol, salt, UV light, heredity, pollution, and infection, falls between 2% and 5%. Richard says people fear the wrong things because the true risk factors are simply less dramatic than the ones we imagine.
- Cancers that have risen sharply all trace back to identifiable causes. Lung cancer in women rose because women started smoking in the 1960s and 1970s, esophageal cancer rose alongside overweight rates, and skin cancer rose due to inadequate UV protection. Richard uses this to argue there is no mysterious cancer “explosion,” just traceable behavior.
- Precancerous mutations form in childhood and take decades to become disease. Because cells proliferate so fast during childhood and adolescence, most of the mutations behind a cancer diagnosed at 50, 60, or 70 were already present by the end of childhood. Lifestyle over the following decades determines whether those dormant cells ever progress.
- Obesity itself creates the chemical environment cancer needs to grow. Fat tissue produces inflammatory molecules like interleukins and TNF-alpha, and inflammation is the condition cancer cells rely on to develop. Staying lean removes that fuel.
- The World Cancer Research Fund’s recommendations, built from 400,000 studies, are the real battle plan. They include a mostly plant-based plate, a body mass index between 21 and 23, red meat capped at 1 pound a week, avoiding processed food, cutting alcohol and salt, and skipping supplements as a cancer-prevention shortcut.
- Phytochemicals are plants’ chemical weapons, not medicine made for humans. Plants can’t run or fight, so they defend themselves chemically, producing tens of thousands of compounds to poison or repel predators. By what Richard calls pure serendipity of evolution, some of those compounds, like curcumin in turmeric, also happen to fight cancer in humans.
- Phytochemicals mostly are not antioxidants; that label undersells what they do. Many act by directly killing cancer cells, blocking the blood-vessel growth tumors need (angiogenesis), reducing inflammation, or triggering cancer cells to self-destruct (apoptosis), the same mechanism behind many chemotherapy drugs. Oxidation, Richard says, is a minor factor in cancer compared to heart disease.
- Eating a diversity of plants creates a hostile “neighborhood” around dormant tumors. Getting 5 to 10 servings of fruits and vegetables a day, especially cabbage, garlic, soy, green tea, and berries, puts high concentrations of these compounds directly around the microtumors we all carry, a process Richard calls paracrine regulation.
“We are all tumor carriers at the beginning of our adult lifestyle, and it is our lifestyle that allow or do not allow these microtumors to evolve into a clinically relevant cancer.”
Dr. Richard Beliveau
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Episode 263 – The metabolic approach to cancer with Dr. Nasha Winters and Jess Higgins Kelley