When Green Tea Isn’t Chemotherapy

When Green Tea Isn’t Chemotherapy

Introduction

Food is powerful. Eating well lowers your risk of many diseases, including cancer. Yet food is not chemotherapy. Still, the idea that broccoli or green tea could replace cancer treatment is tempting. It feels safe, natural, and hopeful.

However, cancer is not treated with vegetables or tea. Cancer is treated with medicine. Let’s break down what food can and cannot do when it comes to cancer.


Broccoli and Cruciferous Vegetables

Broccoli, cabbage, Brussels sprouts, and other cruciferous vegetables contain natural compounds like sulforaphane. In lab studies, these compounds slow cancer cell growth. That is promising.

Furthermore, population studies show that people who regularly eat cruciferous vegetables often have a lower risk of colon, lung, and breast cancers. So, broccoli can help lower risk.

But here is the key point: broccoli does not cure cancer. No oncologist prescribes broccoli as chemotherapy. Prevention is not the same as treatment.


Green Tea and Its Limits

Green tea is another food often linked to cancer prevention. It contains catechins, such as EGCG, which in test tubes can slow cancer cell growth. Some studies even suggest that people who drink green tea regularly may have slightly lower cancer rates.

But again, that is prevention. Once cancer begins, drinking green tea will not stop it. And when taken as concentrated supplements, green tea extracts can actually harm the liver.

So, green tea is a fine beverage. But it is not chemotherapy. Personally, I prefer black tea — green tea tastes a little too much like pond water for me.


Scams and False Hope

Sadly, the gap between prevention and treatment is where scams thrive. You’ve probably heard of things like:

  • Gerson Therapy: organic juices and coffee enemas, still promoted in Mexico. No evidence, high risk.

  • Apricot pits and soursop: marketed as natural cures, but linked to toxicity.

  • Ivermectin: useful for parasites, but not proven in cancer.

Then there’s the Warburg effect. Otto Warburg correctly observed that cancer cells use sugar differently. But modern science has shown cancer is not a “sugar disease.” It is a DNA disease caused by mutations. Cancer cells can grow on sugar, ketones, and even vitamins. You cannot starve cancer with diet.


What Medicine Has Done

Now, let’s talk about the real success stories.

Chemotherapy in the past was harsh, like carpet bombing. Yet it saved lives. My brother Jimmy was diagnosed with stage 4 Hodgkin’s disease in 1969. Thanks to experimental chemotherapy and radiation, he lived 37 more years.

Today, treatment is even better. We have:

  • Targeted therapies that hit the exact mutation in a tumor.

  • Immunotherapy drugs that unleash the body’s own defenses.

  • Combination therapies that extend survival with fewer side effects.

And vaccines are changing everything. The HPV vaccine prevents cervical, anal, and many oral cancers. It may even help lower melanoma risk. Researchers are now studying vaccines for brain cancers like glioblastoma and even for pancreatic cancer.

No apricot pit will ever do that.


Food Still Matters

We should not ignore food. A poor diet filled with ultra-processed foods and low in fiber increases cancer risk. In fact, the rise in colon cancer among younger adults is likely tied to diets low in fiber and high in processed foods.

The Mediterranean diet, rich in fruits, vegetables, whole grains, olive oil, and legumes, does more than prevent cancer. The large EPIC studies show it also lowers the risk of cancer coming back after treatment. That makes it the best diet for cancer prevention and recurrence.

So yes, food matters. Food empowers you. But food is not medicine. Food lowers risk. Medicine treats disease. Together, they protect us.


Conclusion

Green tea and broccoli are healthy. The Mediterranean diet is the best prevention strategy we know. But once cancer develops, treatment is essential.

Food isn’t chemotherapy. Medicine is. And that is something we should all be grateful for.


References

  1. World Cancer Research Fund/American Institute for Cancer Research. Diet, Nutrition, Physical Activity and Cancer: a Global Perspective. Continuous Update Project Expert Report 2018.

  2. Buckland G, Agudo A, Luján L, Jakszyn P, Bueno-de-Mesquita HB, Palli D, Boeing H, Carneiro F, Krogh V, Sacerdote C, Tumino R, Panico S, Nesi G, Manjer J, Regnér S, Johansson I, Stenling R, Sanchez MJ, Dorronsoro M, Barricarte A, Navarro C, Quirós JR, Allen NE, Key TJ, Bingham S, Kaaks R, Overvad K, Jensen M, Olsen A, Tjønneland A, Peeters PH, Numans ME, Ocké MC, Clavel-Chapelon F, Morois S, Boutron-Ruault MC, Trichopoulou A, Lagiou P, Trichopoulos D, Lund E, Couto E, Boffeta P, Jenab M, Riboli E, Romaguera D, Mouw T, González CA. Adherence to a Mediterranean diet and risk of gastric adenocarcinoma within the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort study. Am J Clin Nutr. 2010 Feb;91(2):381-90. doi: 10.3945/ajcn.2009.28209. Epub 2009 Dec 9. PMID: 20007304.

  3. Jenkins DJA, et al. Green tea catechins and cancer prevention. J Nutr. 2003;133(11 Suppl 1): 3242S–3246S.

  4. WHO. Human papillomavirus (HPV) vaccines. Updated 2022.

  5. Hanahan D. Hallmarks of Cancer: New Dimensions. Cancer Discov. 2022;12(1): 31–46.

About the Author
You probably first saw Dr. Simpson on TikTok or Instagram or Facebook or Twitter. Dr. Terry Simpson received his undergraduate, graduate, and medical degrees from the University of Chicago, where he spent several years in the Kovler Viral Oncology laboratories doing genetic engineering. Until he found he liked people more than Petri dishes. After a career in surgery, his focus is to make sense of the madness, and bust myths. Dr. Simpson, an advocate of culinary medicine, believes in teaching people to improve their health through their food and in their kitchen. On the other side of the world, he has been a leading advocate of changing health care to make it more "relationship based," and his efforts awarded his team the Malcolm Baldrige award for healthcare in 2018 and 2011 for the NUKA system of care in Alaska and in 2013 Dr Simpson won the National Indian Health Board Area Impact Award. A frequent contributor to media outlets discussing health related topics and advances in medicine, he is also a proud dad, author, cook, and doctor “in that order.” For media inquiries, please visit www.terrysimpson.com.