How to Reduce Your Risk of Cancer

Cancer remains one of the most feared diagnoses in the world — and understandably so. But here is something most people do not hear enough: a significant number of cancer cases are preventable. Research from organisations like the World Health Organization (WHO) estimates that between 30% and 50% of all cancers can be avoided through lifestyle changes and early detection. That means the choices you make today — what you eat, how much you move, whether you smoke — can genuinely shift the odds in your favour.

This guide walks you through evidence-based, actionable steps you can start taking right now to lower your cancer risk. Whether you are in your twenties or your sixties, it is never too late — or too early — to start.

Understanding Cancer Risk Factors: 12 Ways You Can and Cannot Control

Before diving into what you can change, it helps to understand the two broad categories of cancer risk factors: those you cannot control and those you can.

Non-modifiable risk factors include your age, family history, genetic mutations (such as BRCA1 and BRCA2 for breast and ovarian cancers), and certain pre-existing medical conditions. These do not mean cancer is inevitable — they simply mean you may need to be more vigilant.

Modifiable risk factors are where your power lies. Tobacco use, alcohol consumption, diet quality, physical activity levels, body weight, sun exposure, and exposure to environmental carcinogens are all areas where deliberate choices can meaningfully reduce your cancer risk.

Understanding the difference between these two categories is the foundation of smart cancer prevention.

1. Quit Smoking — and Avoid Secondhand Smoke

If there is one single action that carries the highest cancer-prevention potential, it is quitting tobacco. Smoking is the leading preventable cause of cancer worldwide. It is directly linked to cancers of the lung, mouth, throat, oesophagus, stomach, kidney, bladder, cervix, and pancreas — among others.

Even if you have smoked for years, stopping now dramatically reduces your risk over time. Within five years of quitting, your risk of mouth, throat, and oesophagus cancers drops by half. Within ten years, your lung cancer risk falls to roughly half that of a current smoker.

And if you do not smoke, protecting yourself from secondhand smoke is equally important. Secondhand smoke contains over 70 known carcinogens, and regular exposure significantly increases lung cancer risk in non-smokers.

1. Follow a Cancer-Protective Diet

What you put on your plate every day has a powerful influence on your cancer risk. A diet rich in whole, plant-based foods and low in processed and red meats is consistently associated with lower rates of several cancers.

Foods That Help Reduce Cancer Risk

• Cruciferous vegetables such as broccoli, cauliflower, Brussels sprouts, and cabbage contain compounds called glucosinolates, which research suggests may help protect cells from DNA damage.
• Berries are loaded with antioxidants — particularly anthocyanins — that combat oxidative stress, a driver of cancer cell development.
• Tomatoes contain lycopene, a carotenoid linked to a reduced risk of prostate cancer.
• Whole grains like oats, brown rice, and whole wheat provide fibre, which is associated with a reduced risk of colorectal cancer.
• Legumes — beans, lentils, chickpeas — are rich in fibre and plant protein, both of which support a healthy gut microbiome that may play a role in cancer prevention.
• Green tea contains catechins, antioxidant compounds that have shown anti-tumour properties in laboratory studies.
• Turmeric contains curcumin, a compound that has been studied for its anti-inflammatory and anti-cancer properties.

Foods and Habits to Limit or Avoid

• Processed meats such as bacon, sausage, hot dogs, and deli meats are classified as Group 1 carcinogens by the International Agency for Research on Cancer (IARC). Limit these significantly.
• Red meat consumed in high quantities is classified as a probable carcinogen (Group 2A). Moderation is key.
• Ultra-processed foods high in sugar, refined carbohydrates, and unhealthy fats contribute to obesity, itself a major cancer risk factor.
• Alcohol — more on this below, but the cancer-diet link includes cutting back on drinking.
• Charred or overcooked meats produce heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs), both of which are carcinogenic compounds.

A largely plant-based eating pattern does not mean you must become vegetarian overnight. Even gradual shifts — adding more vegetables, swapping white bread for whole grain, reducing processed snacks — add up over time.

1. Maintain a Healthy Body Weight

Obesity is now recognised as a significant risk factor for at least 13 different types of cancer, including breast (post-menopausal), colon, rectum, endometrium, oesophagus, kidney, pancreas, and liver cancers.

Excess body fat, particularly around the abdomen, drives chronic inflammation and produces higher levels of hormones like insulin and oestrogen that can stimulate cancer cell growth.

The good news: even modest weight loss — 5% to 10% of your body weight — has measurable health benefits, including reducing cancer-related biomarkers like insulin levels and inflammatory cytokines.

A combination of dietary changes and regular physical activity is the most effective and sustainable path to a healthy weight.

1. Get Moving: The Cancer-Fighting Power of Exercise

Physical activity is one of the most underrated tools in cancer prevention. Regular exercise is associated with a lower risk of at least eight cancers, including breast, colon, endometrial, kidney, bladder, oesophagus, gastric, and lung cancers.

Exercise works through several biological pathways: it lowers insulin and oestrogen levels, reduces inflammation, improves immune surveillance, and helps maintain a healthy weight.

The current guidance from major cancer organisations is at least 150 to 300 minutes of moderate-intensity aerobic activity per week, or 75 to 150 minutes of vigorous activity — ideally spread across the week. Strength training at least twice a week adds additional benefit.

You do not need a gym membership or fancy equipment. Walking briskly, cycling, swimming, dancing, and even vigorous housework all count. The key is consistency over intensity.

1. Limit Alcohol or Avoid It Altogether

Alcohol is a Group 1 carcinogen. That is a scientific classification meaning there is sufficient evidence that it causes cancer in humans. It is linked to cancers of the mouth, pharynx, larynx, oesophagus, liver, colon, rectum, and breast.

The risk rises with the amount consumed, but there is no truly “safe” level of alcohol when it comes to cancer. Even light drinking increases breast cancer risk slightly. The more you drink, the higher your risk.

If you choose to drink, keeping it to a minimum — no more than one standard drink per day — lowers your exposure. Cutting it out entirely, even for a few months at a time, gives your liver and immune system a break.

1. Protect Your Skin from UV Radiation

Skin cancer — including melanoma, the deadliest form — is one of the most common and most preventable cancers in the world. The primary cause is ultraviolet (UV) radiation from the sun and artificial sources like tanning beds.

Here is how to protect yourself:

• Apply a broad-spectrum sunscreen of at least SPF 30 every day, even on cloudy days.
• Seek shade during peak sun hours (typically 10am to 4pm).
• Wear protective clothing, wide-brimmed hats, and UV-blocking sunglasses.
• Never use tanning beds or sunlamps.
• Perform regular skin self-checks and report any new or changing moles to your doctor promptly.

In Nigeria and much of sub-Saharan Africa, UV exposure is intense year-round. While melanoma risk is lower in people with darker skin tones, it is not zero — and sun protection remains important for everyone.

1. Get Vaccinated Against Cancer-Causing Infections

Some cancers are directly caused by viral infections — and these can be prevented through vaccination.

• HPV (Human Papillomavirus) vaccine protects against the strains of HPV responsible for cervical cancer (the second most common cancer in Nigerian women), as well as cancers of the vulva, vagina, penis, anus, and throat. The vaccine is most effective when given before sexual activity begins, ideally between ages 9 and 14, but remains beneficial up to age 26 and beyond.
• Hepatitis B vaccine protects against the hepatitis B virus, a major cause of liver cancer (hepatocellular carcinoma), which has a high incidence in Nigeria and across West Africa.

If you or your children have not been vaccinated, speak to a healthcare provider about your options. These are among the most cost-effective cancer prevention tools available.

1. Reduce Exposure to Environmental and Occupational Carcinogens

Many people are exposed to cancer-causing substances in their environment or workplace without even knowing it. Common carcinogens include:

• Asbestos — linked to lung cancer and mesothelioma
• Radon gas — a naturally occurring radioactive gas that accumulates in poorly ventilated buildings and is the second leading cause of lung cancer
• Benzene and formaldehyde — found in some workplaces and household products
• Aflatoxins — moulds that grow on improperly stored grains and nuts, particularly relevant in tropical climates; strongly linked to liver cancer
• Pesticides and industrial chemicals — linked to various cancers with long-term exposure

Practical steps include ensuring good ventilation in your home, storing food properly, using protective equipment if you work in a high-risk environment, and being aware of what cleaning products and pesticides you bring into your living space.

1. Prioritise Cancer Screening and Early Detection

No matter how healthy your lifestyle is, regular screening is one of the most powerful ways to catch cancer early — when it is most treatable. Many cancers, if caught in their early stages, have survival rates above 90%.

Recommended screenings for adults include:

• Cervical cancer screening (Pap smear / HPV test): Every 3 to 5 years for women aged 21 to 65
• Breast cancer screening (mammography): Annually or every two years for women aged 40 to 74; earlier if you have a family history
• Colorectal cancer screening: Starting at age 45 for average-risk adults; earlier for those with family history
• Prostate cancer screening: Discussion with your doctor from age 50 (or 45 for high-risk men)
• Skin cancer: Annual skin exam, especially for those with a history of sun exposure

In Nigeria, access to screening can be a challenge — but it is improving. Organisations like the DeeDee Memorial Foundation are doing vital work to improve cancer awareness, support cancer patients and survivors, and promote early detection in communities that need it most. Connecting with such organisations can open doors to resources and information you might not find elsewhere.

1. Manage Chronic Inflammation and Hormonal Health

Chronic, low-grade inflammation is increasingly recognised as a driver of cancer development. Conditions like type 2 diabetes, metabolic syndrome, and chronic infections all create inflammatory environments that can promote tumour growth.

Steps to reduce systemic inflammation include:

• Following an anti-inflammatory diet (see the dietary section above)
• Getting adequate sleep (7 to 9 hours per night for most adults)
• Managing stress through mindfulness, therapy, exercise, or community support
• Treating underlying chronic conditions like diabetes or high blood pressure

Hormonal health also matters. Prolonged exposure to high levels of oestrogen — through hormone replacement therapy (HRT), early menstruation, late menopause, or not having children — increases breast cancer risk. Discuss your personal hormonal history with your doctor to understand your individual risk profile.

1. Know Your Family History and Genetic Risks

Family history is not destiny, but it is important information. If close relatives — parents, siblings, grandparents — have had certain cancers, your risk may be elevated. Some cancers, including breast, ovarian, colorectal, and prostate cancers, have known hereditary components.

If you have a strong family history of cancer, talk to your doctor about:

• Earlier or more frequent screening
• Genetic counselling and testing (e.g., for BRCA mutations)
• Preventive medications (chemoprevention) in some cases
• Lifestyle changes tailored to your specific risk profile

Understanding your family history empowers you to take proactive steps. Many genetic counselling services are becoming available in Nigeria, and organisations like the DeeDee Memorial Foundation can point you to appropriate resources.

1. Practise Stress Management and Prioritise Mental Wellbeing

While stress does not directly cause cancer, it does affect the immune system, hormone levels, and behavioural choices (like smoking or drinking more). Chronic stress also compromises immune surveillance — the body’s natural ability to detect and destroy abnormal cells before they become tumours.

Healthy stress management strategies include regular physical activity, meditation or mindfulness, quality sleep, strong social connections, creative outlets, and seeking professional mental health support when needed.

Your psychological wellbeing is not separate from your physical health — they are deeply interconnected.

The Role of Advocacy and Community in Cancer Prevention

Cancer prevention is not only an individual effort — it is a community one. Access to education, healthcare, and support systems makes a significant difference in cancer outcomes, particularly in low- and middle-income settings.

Foundations and non-profit organisations working in this space play a crucial role. The DeeDee Memorial Foundation is one such organisation, dedicated to raising cancer awareness, supporting affected families, and advocating for better healthcare access in Nigeria. Following and supporting such organisations amplifies the reach of life-saving information.

For broader global guidance on cancer prevention, the World Health Organization’s cancer resources and the American Cancer Society offer extensively researched, regularly updated information.

Frequently Asked Questions

Can cancer truly be prevented? 

Not all cancers can be prevented, but research suggests that up to 50% of cancer cases worldwide may be preventable through lifestyle changes, vaccinations, and regular screening. While genetics and chance play a role, your daily habits have a meaningful impact on your overall cancer risk.

What is the single most effective thing I can do to reduce my cancer risk? 

If you smoke, quitting is the single most impactful step you can take. For non-smokers, maintaining a healthy weight through a balanced diet and regular physical activity offers the broadest protection against multiple cancer types.

Are there specific foods that can prevent cancer?

No single food “prevents” cancer, but a consistently healthy diet rich in vegetables, fruits, whole grains, and legumes — and low in processed meats, ultra-processed foods, and alcohol — significantly lowers your overall risk.

How important is cancer screening if I feel perfectly healthy? 

Extremely important. Many cancers cause no symptoms in their early, most treatable stages. Regular screening can detect cancer before symptoms appear, which dramatically improves survival rates. Feeling well is not a reliable indicator of cancer-free status.

Does stress cause cancer? 

Stress alone has not been shown to directly cause cancer. However, chronic stress weakens immune function and may lead to behaviours — like poor sleep, heavy drinking, or smoking — that increase cancer risk. Managing stress is an important part of overall cancer prevention.

At what age should I start getting screened for cancer? 

It varies by cancer type. Cervical cancer screening typically begins at age 21; colorectal at 45; breast cancer screening around 40 to 50. High-risk individuals (due to family history or genetic factors) may need to begin earlier. Discuss your specific situation with your healthcare provider.

Are there cancer prevention resources available in Nigeria? 

Yes. Organisations like the DeeDee Memorial Foundation are working actively to improve cancer awareness and support in Nigeria. Government-run hospitals and many NGOs offer free or subsidised screening in some areas.

Is alcohol really that dangerous for cancer risk? 

Yes. Alcohol is classified as a Group 1 carcinogen by the International Agency for Research on Cancer. It is linked to at least seven types of cancer. Even moderate drinking increases risk slightly, and heavy drinking significantly increases it.

Conclusion

Cancer can feel like something that happens to other people — until it happens to you or someone you love. But the truth is, cancer prevention is not a passive process. It is something you actively participate in through the choices you make every single day.

You do not need to be perfect. You do not need to overhaul your entire life overnight. What you do need is a commitment to gradual, consistent progress — choosing the salad over the sausage roll a little more often, lacing up your trainers a few times a week, booking that screening you have been putting off.

The steps outlined in this guide — from quitting smoking and improving your diet to getting vaccinated and scheduling regular check-ups — are not about fear. They are about taking back control.

Cancer prevention is personal. It is communal. And it starts right now, with the very next choice you make.

Are you looking for cancer awareness resources, support for a loved one, or guidance on cancer prevention in Nigeria? The team at the DeeDee Memorial Foundation is here to help. They are committed to making cancer education and support accessible to every Nigerian, regardless of background or location.

Contact the DeeDee Memorial Foundation today and take a meaningful step towards a healthier, cancer-aware future — for yourself and your community.

This article is intended for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for personalised guidance on cancer screening and prevention.