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Deutsch (EUR)Budwig Diet: Quark, Flaxseed Oil, Research and Risks
Budwig Diet: Quark, Flaxseed Oil, Research and Risks
The Budwig diet is a dietary regimen best known for combining quark or cottage cheese with flaxseed oil. It became popular through claims about cancer and the idea that proteins and polyunsaturated fatty acids could influence cellular metabolism.
Some foods included in the diet can be part of a balanced eating pattern. This does not establish that the complete regimen treats cancer, diabetes, autoimmune conditions or other serious illnesses.
1. What is the Budwig diet?
The regimen emphasises fresh foods, especially quark or cottage cheese, flaxseed oil, flaxseed, fruit, vegetables, whole grains and nuts. Versions of the diet restrict added sugar and highly processed foods. Its best-known element is the dairy-and-oil mixture. [1]
Supporters claim that dairy proteins improve the body's use of the fatty acids in flaxseed oil. This proposed mechanism is not proof of a clinical benefit. Mixing these foods does not establish that they can shrink a tumour or prolong life.
2. Johanna Budwig and her hypothesis
German biochemist Johanna Budwig developed the regimen in the 1950s. She proposed that combining unsaturated fatty acids with sulphur-containing proteins could improve cellular respiration and influence tumours.
This proposed explanation has not been established as a mechanism by which the mixture treats cancer. A plausible biological idea needs testing in people before a treatment benefit can be claimed. [2]
3. Cancer: what does the research show?
Cancer Research UK and CAM Cancer report no published clinical trials establishing the complete Budwig diet as an effective cancer treatment. There is no reliable basis for recommending it to shrink tumours, prevent metastases or extend survival. [1] [2]
A specific study: flaxseed before prostate surgery
In a randomised trial by Demark-Wahnefried and colleagues (2008), 161 men awaiting prostate cancer surgery were assigned to usual diet, 30 g of flaxseed per day, a low-fat diet, or both interventions. The intervention lasted about 30 days on average.
The flaxseed groups had a lower Ki-67 marker of cell proliferation in tumour tissue. This was a biological marker, not evidence of a cure. The study did not establish longer survival or prevention of metastases and did not test quark mixed with flaxseed oil. The quantity describes the study; it is not a recommended dose for readers. [3]
Whether these short-term marker changes translate into a long-term clinical benefit. Results for seeds cannot automatically be applied to oil or the complete diet.
Feeling better after changing food habits does not, by itself, show that a tumour is shrinking. The treating team assesses the disease through appropriate examinations.
4. Which elements have nutritional value?
Flaxseed oil provides ALA but does not have the same fibre and lignan content as whole or ground seeds. Quark is unsuitable for someone with a milk-protein allergy; tolerance of lactose varies.
Nutritional value is not evidence of disease treatment. These foods can be included in a varied diet without adopting the whole regimen. [1] [5]
5. Risks depend on the whole diet
A portion of quark with oil does not automatically cause a nutrient deficiency. Problems may arise when strict exclusions reduce total energy or nutrient intake, or when the diet replaces effective treatment. Large amounts of oil can also make the diet high in fat; it is not automatically low in calories.
- Energy, protein and micronutrient intake depend on the actual food choices and quantities.
- Large amounts of flaxseed can cause bloating and bowel changes; a lot of oil may cause diarrhoea.
- Food allergies and individual tolerance need to be considered.
- Delaying diagnosis or treatment is a separate and important risk.
6. What about claims for other illnesses?
Claims have also been made for diabetes, cardiovascular conditions and arthritis. Historical claims do not demonstrate effectiveness. The cited sources do not provide a basis for recommending the Budwig mixture as a treatment for these conditions. [2]
Food choices should reflect the diagnosis, nutritional needs and tolerance. A dietary change is not a reason to stop prescribed medicines. The diet does not replace insulin or other necessary diabetes treatment.
7. Is flaxseed oil the same as omega-3 from fish?
No. Flaxseed oil mainly supplies ALA. The body can convert some ALA into EPA and DHA, but conversion is limited and varies between people. [5]
| Source | Main omega-3 form | What this means |
|---|---|---|
| Flaxseed oil | ALA | An essential fatty acid; conversion to EPA and DHA is limited. |
| Fish and marine foods | EPA + DHA | Provide these forms directly. |
| Algal oils | Mainly DHA; some also EPA | Composition depends on the product. |
Storage and tolerance
Follow the manufacturer's storage instructions, usually keeping the oil cool and protected from light. It is not intended for high-temperature frying.
A rapid increase in flaxseed intake may cause bloating, cramps or changes in bowel habits. Ensure adequate fluid intake when increasing fibre, taking any medical fluid restrictions into account. [6]
8. During cancer treatment
Monitor food intake, body weight and digestive symptoms. Significant dietary restrictions can worsen nutritional status. Discuss major changes, fasting and supplements with the treating team. Maintaining adequate energy and protein intake may be particularly important. [4]
CAM Cancer describes a theoretical risk of increased bleeding when flaxseed oil is combined with anticoagulant or antiplatelet medicines. This is not a reliably demonstrated interaction from an ordinary food portion. Discuss planned regular use of larger quantities or supplements with a doctor or pharmacist; do not stop your medicines. [2]
9. A practical approach to food choices
If you enjoy these foods, consider them within a varied, sufficiently nourishing diet. Include appropriate protein sources, fruit and vegetables, whole grains, nuts and seeds according to tolerance and clinical needs. Choose portions and fluids to suit your situation.
During serious illness, maintaining food intake and muscle mass can matter more than following rigid dietary rules. Medical nutrition may be needed when ordinary meals are insufficient; discuss this with the care team. [4]
10. When to seek advice
Contact your healthcare team if you have unintentional or rapid weight loss, persistent weakness, repeated vomiting or diarrhoea, dehydration, worsening blood glucose control, bleeding, new symptoms, or difficulty eating.
Discuss a major dietary change before starting it during chemotherapy, radiotherapy, immunotherapy or around surgery. [4]
Frequently asked questions
Does the Budwig diet cure cancer?
What is the Budwig mixture?
Is flaxseed oil a source of omega-3?
Is flaxseed oil a medicine for cancer?
Can the diet treat diabetes?
Is it a treatment for autoimmune conditions?
Can the diet be harmful?
Can I use it during cancer treatment?
What to remember
Quark and flaxseed oil can be foods within a varied diet. The complete Budwig diet is not a proven cancer treatment. Research on flaxseed markers does not establish a cure, and nutritional needs should take priority over rigid rules.
Scientific sources and research
Sources checked on 24 October 2026. The study discussed below investigated flaxseed, not the complete Budwig diet.
- Cancer Research UK – Budwig diet
- CAM Cancer / NAFKAM – Budwig diet
- Demark-Wahnefried et al. (2008). Flaxseed Supplementation (not Dietary Fat Restriction) Reduces Prostate Cancer Proliferation Rates in Men Presurgery. DOI: 10.1158/1055-9965.EPI-08-0008
- Muscaritoli et al. (2021). ESPEN practical guideline: Clinical Nutrition in cancer. DOI: 10.1016/j.clnu.2021.02.005
- NIH Office of Dietary Supplements – Omega-3 Fatty Acids
- Memorial Sloan Kettering Cancer Center – Budwig Diet