Starving Cancer: The Hidden Power of Food, Fasting, and the Body’s Inner Terrain

Mark Hyman

10 nov 2025

Episode description

Cancer can be seen as a seed that only sprouts in the right soil—the body’s inner landscape. Today, that soil is changing fast, and cancer rates are climbing, especially among young people. Our modern diet—packed with sugar, processed foods, and nonstop snacking—keeps the body flooded with signals to grow, not heal. But there’s good news: by eating real, colorful foods and giving the body time to rest between meals, we can calm inflammation, balance our gut, and make our inner soil far less welcoming to disease. The power to shift the story lies in every bite and every pause we take.

In this episode, I discuss, along with Dr. Jason Fung and Dr. Thomas Seyfried, how modern diets and constant eating create a fertile soil for disease.

Dr. Jason Fung is a physician, author, and researcher. His groundbreaking science-based books about diabetes and obesity, The Diabetes Code, The Obesity Code, and The Complete Guide to Fasting have sold over one million copies and challenged the conventional wisdom that diabetics should be treated with insulin. Dr. Fung is also the co-founder of The Fasting Method, a program to help people lose weight and reverse Type 2 Diabetes naturally with fasting. His work on fasting has been cited by CNN, Time, The Atlantic, Forbes, The Toronto Star, and many other media outlets. His latest book is The Cancer Code: A Revolutionary New Understanding of a Medical Mystery.

Dr. Thomas Seyfried is an American professor of biology, genetics, and biochemistry at Boston College. He received his Ph.D. from the University of Illinois Urbana-Champaign in 1976 and did his postdoctoral fellowship at the Yale University School of Medicine. Dr. Seyfried has over 150 peer-reviewed publications, and his research focuses primarily on the mechanisms driving cancer, epilepsy, and neurodegenerative diseases and calorie-restricted ketogenic diets in their prevention and treatment. He is the author of Cancer as a Metabolic Disease: On the Origin, Management, and Prevention of Cancer and presently serves on the Nutrition & Metabolism, Neurochemical Research, Journal of Lipid Research, and ASN Neuro editorial boards.

This episode is brought to you by BIOptimizers.

Head to bioptimizers.com/hyman and use code HYMAN to save 15%.

Full-length episodes can be found here:
Is Cancer Caused By Sugar?

How Can My Diet Help Prevent Cancer?

A Radical New Dietary Approach To Cancer Treatment

Episode description

In this episode, I discuss, along with Dr. Jason Fung and Dr. Thomas Seyfried, how modern diets and constant eating create a fertile soil for disease.

This episode is brought to you by BIOptimizers.

Head to bioptimizers.com/hyman and use code HYMAN to save 15%.

Full-length episodes can be found here:
Is Cancer Caused By Sugar?

How Can My Diet Help Prevent Cancer?

A Radical New Dietary Approach To Cancer Treatment

Mindsip insights from this episode:

Utilize fasting to protect normal cells during chemotherapy

Fasting before, during, and after chemotherapy can put your normal cells into a protected state, reducing side effects while leaving cancer cells vulnerable.

#cancer

#fasting

Recognize snacking as a modern dietary shift

The habit of snacking is a modern invention, as Americans went from eating three times a day in 1977 to almost six times a day by 2004.

#nutrition

Boost gut health to produce anti-cancer postbiotics

Healthy gut bacteria produce beneficial compounds called postbiotics, such as butyrate, which have anti-cancer properties.

#cancer

#gut

Prioritize body environment over genetics in cancer growth

The environment in your body (the soil) is a more important factor in whether cancer grows than your genetics (the seed).

#cancer

#environment

Recognize insulin as a growth factor fueling cancer

Insulin is not just a metabolic hormone but also a primary growth factor that signals cells to grow, which can fuel cancer.

#cancer

#insulin

Leverage fat restriction to starve cancer cells

Cancer cells have defective mitochondria and cannot efficiently use fats or ketones for energy, forcing them to rely on fermenting glucose and glutamine.

#cancer

#mitochondria

Activate autolytic cannibalism to fuel your body against cancer

Through a process called autolytic cannibalism, your body can turn on and consume its own cancer cells for fuel when you lower blood sugar and raise ketones.

#cancer

#metabolism

Challenge food industry’s self-approval of chemicals under GRAS loophole

99% of food chemicals introduced since 2000 were approved by the food companies themselves, not the FDA, through a loophole called "Generally Recognized As Safe" (GRAS).