CANCER IS NOT RANDOM
What You Can Control Matters More Than You Think
Cancer is often spoken about as though it is largely out of our control—something driven by genetics or simply bad luck. But what we are seeing more clearly, both in the research and in clinical practice, is that this is not entirely true.
A large global analysis published in Nature Medicine looked at cancer risk across 185 countries and found that more than one-third of cancers are linked to modifiable factors—things we are exposed to and interact with every day.
That is a powerful shift in perspective.
It means that while we cannot control everything, we can significantly influence the environment in which disease develops. Cancer, like many chronic conditions, is not just an event—it is a process shaped over time by metabolism, inflammation, immune function, and cumulative exposures.
From a functional medicine standpoint, this aligns with how we think about health: the terrain matters.
What Drives Cancer Risk Over Time
When researchers looked at the data, several key drivers emerged—not surprisingly, but importantly.
Smoking remains the largest contributor globally, followed by infections, alcohol, and environmental exposures. These factors all share something in common: they create chronic stress at the cellular level, leading to inflammation, DNA damage, and impaired repair mechanisms.
But what is equally important is what sits underneath these exposures:
metabolic health and mitochondrial function.
If the body’s energy systems are not working efficiently, if inflammation is elevated, and if the immune system is not functioning optimally, the body becomes less capable of identifying and correcting abnormal cell behavior.
This is where prevention becomes powerful.
A Different Way to Think About Cancer Prevention
In my practice, I don’t approach cancer prevention as a checklist. I approach it as creating an internal environment where the body can function, repair, and regulate effectively.
Cancer prevention starts with a few foundational areas:
1. Metabolic Health and Nutrition
The goal is not extremes—it is balance.
Stable blood sugar, adequate protein, and nutrient-dense whole foods support mitochondrial function and reduce inflammatory signaling. Highly processed foods, excess alcohol, and poor dietary patterns create the opposite effect, placing stress on the system over time.
2. Body Composition and Movement
Excess body fat is not just a storage issue—it is metabolically active and inflammatory.
Regular movement improves insulin sensitivity, supports mitochondrial function, and reduces systemic inflammation. This does not require extremes. In fact, consistency matters far more than intensity.
Walking daily, combined with strength training a few times per week, is one of the most effective and sustainable cancer prevention strategies .
3. Hormonal and Stress Balance
Chronic stress is one of the most underestimated drivers of disease – icluding cancer.
Elevated cortisol over time impacts immune function, increases inflammation, and disrupts metabolic regulation. Supporting the nervous system through sleep, light exposure, recovery, and—when appropriate—hormonal balance is critical.
This is especially important for women in perimenopause and menopause, where shifting hormones can amplify these effects.
4. Sleep and Circadian Rhythm
Sleep is not optional when it comes to cancer prevention.
It is during sleep that the body repairs DNA, regulates immune function, and resets metabolic pathways. Poor sleep over time disrupts all of these systems and increases long-term risk.
5. Reducing Toxic Load
We cannot eliminate all toxin exposures, but we can reduce the most significant ones.
This includes:
- Avoiding smoking and limiting alcohol
Being mindful of environmental toxins
Improving air and water quality where possible
Choosing cleaner personal and household products
Small, consistent changes in these areas can significantly reduce cumulative exposure over time.
The Bigger Picture of Cancer Prevention
What this research reinforces is something I have believed—and practiced—for decades:
Health is not random. It is built over time. The same is true for disease – including cancer.
When we focus on improving metabolic health, supporting the immune system, optimizing hormones, and reducing chronic stress and inflammation, we are not just improving how we feel today—we are changing our long-term trajectory.
This is not about fear. It is about empowerment.
Because when you understand that your daily choices influence your biology, you also understand that you have the ability to change it.
Cancer Prevention Doctor | Austin, TX
If you live in Austin, TX and are interested in learning more about how to acheive your health and wellness goals, schedule an appointment with integrative functional medicine specialist Dr. Ruthie Harper. Her holistic approach to health optimization addresses both immediate concerns and long-term wellness objectives to help you achieve your best possible health. To learn more about cancer prevention and our other integrative health services, schedule an appointment with Dr. Ruthie Harper today.
