Link to the video is here: Sugar And Cancer

Does Sugar Cause Cancer? What Dr. Thomas Seyfried Gets Wrong

When people search “does sugar cause cancer”, they’re often afraid — especially those living with breast cancer, colon cancer, or metastatic disease. Viral clips from Dr. Thomas Seyfried and recent Thomas Seyfried interviews claim that excess sugar directly causes cancer, sugar and glutamine fuel tumors, and that a keto diet or zero-carb plan can starve cancer. That message sounds simple… but cancer biology is not simple.

Let’s separate myths and facts about cancer using real data.

What Is Cancer Metabolism, Really?

Cancer cells do use glucose — but so do immune cells, the brain, and almost every tissue in your body. In cancer metabolism, tumors rely on sugar because they grow fast, not because sugar created them. All cells that grow fast use the same metabolic programming - active immune cells have the same Warburg effect!

If sugar caused cancer, people with chronically high blood sugar (like diabetics) would have massive increases in every type of tumor. They don’t. Across large populations, diabetes raises overall cancer risk by about 20% — far less than the 3,800% increase caused by aging.

Some cancers (like colorectal cancer and liver cancer) do show modest links to blood sugar. Others — including prostate cancer and melanoma — actually occur less often in diabetics. That alone breaks the sugar cancer link theory.

Sugar doesn’t give you cancer.
It may sometimes help tumors grow — but it does not create them.

Why Cancer Rates Are Misunderstood

Dr. Seyfried often points to rising cancer numbers as proof of sugar’s danger. But those numbers ignore two huge factors:

• Population growth
• Population aging

As people live longer, cancer cases rise — even when risk per person falls. When researchers adjust for age, most major cancers — including breast cancer, lung cancer, and colon cancer — are declining. That’s progress, not failure.

Does the Keto Diet Starve Cancer?

The keto diet for cancer patients and metabolic therapy for cancer can often be helpful — but not in the way it’s being sold.

Lowering carbs or short-term fasting can:

• Reduce side effects of chemotherapy
• Protect healthy cells
• Improve treatment tolerance
• Slightly slow tumor growth
  

But it does not eliminate cancer. Some tumors are fat-adapted and grow faster on keto. Others become more invasive when sugar is restricted. There is no best diet for cancer that works for everyone.

Diet is a supportive tool, not a cure.

What About Glutamine?

Claims that removing glutamine will destroy tumors come from mouse studies using toxic metabolic poisons — not food restriction. You cannot remove glutamine from the human body without severe malnutrition, immune suppression, and treatment failure.

You cannot starve cancer with diet alone.

The Truth Cancer Patients Deserve

You did not cause your cancer.
You are not failing if you don’t eat keto.
You are not weak for wanting normal food.

Science-based oncology, personalized cancer treatment, emotional stability, and immune support — not shame — are what improve outcomes.

If you want to understand how cancer diet fits into your situation, that’s a conversation worth having — grounded in biology, not blame.

Disclaimer:  This content is for educational purposes only and is not medical advice. It does not replace guidance from your healthcare provider. Cancer and treatment decisions are highly individual—always consult your physician or qualified healthcare professional regarding your specific situation.
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