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Deutsch (EUR)Cancer Prevention: What Reduces Risk and What We Know About Mitochondria
KINGRAY ACADEMY · CELLS AND METABOLISM
Cancer Prevention: What Reduces Risk and What We Know About Mitochondria
Cancer risk can be reduced, but not eliminated. Proven measures have the greatest practical value: avoiding tobacco and harmful exposures, being active, eating well, vaccination and recommended screening. Where do mitochondria fit into this picture?
Reducing risk
Everyday habits and our environment influence the likelihood of developing some cancers.
Early detection
Screening is intended for people without symptoms and follows specific criteria based on cancer type and risk.
Research limits
The role of mitochondria in cells does not prove that a particular supplement prevents cancer.
1. How many cases could be prevented?
A WHO/IARC analysis published in 2026 estimated that 37% of new cancer cases worldwide in 2022 were linked to preventable causes. This is a population estimate, not a personal probability or a guarantee of protection. [1]
A cancer diagnosis does not mean that someone has neglected their health. Not every risk is within our control, and cancer can develop despite a healthy lifestyle.
2. Which measures make a practical difference?
WHO and WCRF recommend a combination of measures. The following overview provides a starting point for everyday decisions. [2, 3]
| Area | Practical action |
|---|---|
| Tobacco | Do not smoke, avoid tobacco smoke and seek professional support when quitting. |
| Alcohol | For cancer prevention, it is best not to drink alcohol. |
| Activity and weight | Be regularly active within your abilities, limit prolonged sitting and avoid excessive weight gain. |
| Diet | Prioritise wholegrains, pulses, vegetables and fruit. Limit processed meat, red meat and sugary drinks. |
| UV radiation | Avoid sunbeds and sunburn; use shade, clothing and sun protection. |
| Environment and work | Follow protective measures when working with carcinogens and address radon in buildings according to local risk. |
Sustainable changes can start with one step: water instead of a sugary drink, for example, or a regular walk. One food cannot replace an overall healthy routine.
3. Infections and vaccination
Some infections can contribute to cancer. Vaccination against HPV and hepatitis B is a preventive measure for people for whom it is recommended. Discuss eligibility and the vaccination schedule according to national guidance and your health. [2]
HPV vaccination does not replace recommended cervical screening. Preventive measures can complement one another. [4]
4. Prevention, screening and investigating symptoms
Screening means looking for disease or precancerous changes in people without symptoms. Some tests reduce the risk of death by detecting cancer earlier. In the cervix and bowel, identifying and removing certain precancerous changes can help prevent cancer from developing. [4]
Appropriate tests and intervals depend on age, relevant organs, family history, individual risk and national guidance. Screening can also have drawbacks, including false results and overdiagnosis; more tests do not automatically mean better care.
Do not wait for screening if you have symptoms
Discuss a new lump, unexplained bleeding, unintentional weight loss or a persistent unusual change with a doctor. These symptoms do not necessarily mean cancer, but they need individual assessment. [2, 5]
5. How do mitochondria relate to prevention?
Mitochondria help generate energy and regulate apoptosis, or programmed cell death. This makes them important in cancer biology research. [6]
However, cancer involves changes in genes that control cell growth and division, as well as interactions with surrounding tissue and the immune system. It cannot be explained solely by “damaged mitochondria”. [7]
A biological mechanism is not a preventive effect
A claim that a substance affects mitochondria or oxidative stress does not, on its own, demonstrate that it reduces cancer incidence in humans. Such a conclusion requires clinical evidence.
6. Supplements, antioxidants and nutrition during treatment
WCRF does not recommend using dietary supplements to prevent cancer. Supplementation may be appropriate for a specific deficiency or another health need, but that is a different objective. [3]
High doses of antioxidants are not automatically protective. In clinical trials, high-dose beta-carotene increased lung cancer risk in smokers. This finding does not apply to ordinary consumption of vegetables and fruit. [8]
For someone already receiving cancer treatment, nutrition is adapted to their condition. Unintentional weight loss and muscle loss need attention; general advice on weight management should not be interpreted as a recommendation to lose weight during treatment. [9]
Frequently asked questions
Can cancer be prevented completely?
No. Proven measures reduce risk but do not guarantee that cancer will not develop. A diagnosis is not evidence of personal failure.
Is there one food that prevents cancer?
No food is known to reliably prevent cancer. Long-term eating patterns and other preventive measures matter more.
Do healthy mitochondria guarantee protection against cancer?
No. Mitochondria are part of cancer biology, but their function is not the only factor in cancer development.
Should I take antioxidants to prevent cancer?
Antioxidant supplements are not generally recommended for cancer prevention. Some high doses can cause harm; a specific nutrient deficiency is addressed individually.
Should I wait for my next screening if I have symptoms?
No. Screening is intended for people without symptoms. Discuss new or persistent unusual symptoms with a doctor, even after a recent negative screening result.
