NewsMovies & TV
The 'Food Beats Cancer Drugs' Viral List: Fact-Checking the Dr. William Li Claims
A widely-shared post credits a real physician-researcher, Dr. William Li, with a long list of specific, dramatic claims about food and cancer. Here's which parts hold up and which are exaggerated beyond what his own research shows.
Original commentary from the Cancer Explained editorial team.
Please note: this page is educational only — it is not medical advice, and it does not speculate about anyone’s health beyond reliable public reporting. For questions about your own health, talk with your healthcare team.
“The body produces 10,000 DNA errors daily. Certain foods like green tea, tomatoes, and berries may inhibit cancer cell blood supply growth.”
Nothing has loaded from Instagram. We do not connect you to Meta unless you ask, because that would let them set cookies through this page. Open it on Instagram instead.
A widely shared post is credited to a Mark Hyman podcast episode featuring Dr. William Li. It makes a long list of specific claims. It says food "outperforms" cancer drugs in lab tests. It says certain foods cut off tumor blood supply. It says one bacterium decides whether immunotherapy works. It gives several precise-sounding numbers about nuts, kiwi, orange juice, and stem cells. It also opens with a story about the doctor's mother reversing a stage 4 diagnosis. (Note: the researcher's name is William Li, not "Lee" as the post spells it.)
What's grounded in real research
Dr. William Li is a real physician and researcher. He's known for popularizing "angiogenesis." That's the idea that tumors need to grow their own blood supply, and that certain foods have compounds that can slow that process in lab and some human studies. That general framework is legitimate. It's the subject of his published work and his book "Eat to Beat Disease." It's also true that diet, gut bacteria, and metabolic health are all active, real areas of cancer research. One example: Akkermansia muciniphila, a gut bacterium studied for a possible link to how well immunotherapy works in some cancer patients.
Where the post overstates the science
Several specific numbers in the post go well beyond what's been established. A single bacterium determining "whether immunotherapy works or fails." A specific fruit improving "DNA self-repair by 20% within two hours." Dark chocolate "doubling stem cells." These are the kind of precise, dramatic figures that don't match the more limited, hedged findings of real nutrition and cancer studies. Those studies typically show modest links, not guaranteed effects.
The claim that "food outperformed drugs" in lab tests mixes up two different things. One is a lab test showing a food compound has some effect at a tested dose. The other is the rigorous, dosed clinical evidence needed to say a food beats an approved cancer drug in the body. That second kind of evidence hasn't been shown. The personal story — a stage 4 diagnosis reversed to "stage zero" through immunotherapy — may be real. But one family's story isn't proof for any of the surrounding diet claims.
What to do with this information
Eating a diet rich in vegetables, fruit, nuts, and fiber is well-supported by cancer prevention research. It's one of several factors that can modestly lower risk. That much of the message is sound. But no food, supplement, or bacterium has been shown to replace or beat proven cancer treatment. Treat specific numbers this precise with doubt unless you can trace them to a named, published study.
How this article was prepared
An AI-assisted editorial system helped prepare this page based on Dr. William Li's published work on angiogenesis and diet, and the original social media post. No named medical reviewer has reviewed it unless one is listed.
Cancer Explained is published by the National Cancer Information Foundation. It is not medical advice and does not suggest a test or treatment.
See an error, old source, or unclear wording? Tell us.
Know someone who needs this?
Plenty of people are looking for something like this and do not know where to start. If this would help a friend or someone you love, send it on — we have written an opening line so you do not have to stare at an empty message. You can change every word of it.
Your message is written and sent in your own email or messaging app — we never see who you send it to, and nothing is added to any list.
Put the story in context
Prevention, possible warning signs, screening, and diagnosis
This story relates to general. The information below is general: it does not reveal anything else about a public person’s health, and not every point applies to every cancer. Personal advice depends on age, symptoms, family history, exposures, and medical history.
Prevention and risk reduction
Not every cancer can be prevented. Avoiding tobacco, protecting skin from ultraviolet radiation, limiting alcohol, staying active, and receiving recommended HPV or hepatitis B vaccination can lower the risk of certain cancers. A risk factor is not a prediction or a cause in one individual.
Symptoms and possible early signs
Possible signs vary and are often caused by conditions other than cancer. Changes worth discussing include a new lump, unexplained bleeding or weight loss, a persistent cough, lasting bowel or bladder changes, a changing skin spot, or symptoms that persist or worsen. Some early cancers cause no symptoms.
Screening and early detection
Screening looks for certain cancers before symptoms begin. Recommended tests exist only for some cancers and depend on age and risk. Screening can have benefits and harms; it is not the same as evaluating a new symptom, and there is no single routine scan or blood test that reliably screens for every cancer.
How cancer is diagnosed
Diagnosis may involve a history and exam, imaging, laboratory tests, and often a biopsy. Pathology can identify the cancer type and may test biomarkers that guide treatment. Symptoms, screening results, tumor markers, or online stories alone cannot confirm cancer.
Learn about this story’s cancer topic
A public story may encourage questions, but it should not be used to estimate your risk or choose testing. Contact a healthcare professional about a persistent or concerning change. Seek urgent care for severe or rapidly worsening symptoms.