How much exercise does it take to reduce cancer risk through myokine release?
Just 30 minutes a day of aerobic physical activity is enough to downregulate 13 types of cancer. The most prominently affected are breast cancer, colon cancer, and prostate cancer. The primary mechanism is a robust release of natural killer cells into the bloodstream, which travel directly to tumour sites and destroy tumour cells.
Exercise doesn't work through a single pathway. Beyond the natural killer cell mobilisation triggered by aerobic activity, both resistance training and aerobic training generate meaningful anti-inflammatory effects — and inflammation is one of the central drivers of tumour growth. The two training modalities therefore compound each other's anti-cancer benefits, making a combined approach more protective than either alone.
This episode of The Diary Of A CEO with Steven Bartlett places the exercise-cancer connection alongside a broader conversation about how physical activity protects multiple organ systems simultaneously — the brain, the cardiovascular system, and the body's defences against cancer all respond to the same 30-minute daily investment.
"Having strong legs is by far the most important tool in your toolbox for the prevention of Alzheimer's disease."
— The Diary Of A CEO with Steven BartlettSee also
Myokines are signaling molecules released from muscles during resistance training that cross the blood-brain barrier and benefit the brain. Key myokines play a central role in neuroprotection and cognitive resilience.
A study on identical twins with the exact same genetic profile, tracked over a 10-year period with cognitive tests and MRIs, found that the twin with stronger legs showed significantly better cognitive outcomes over time.
The ApoE4 gene (Apolipoprotein E gene) is one of the strongest genetic risk factors for Alzheimer's disease. One copy raises risk by two to three times for males and up to six-fold for females; two copies raise it tenfold for males and fifteenfold for females.