Good question. The claim you mention — that a “juice of a famous Austrian doctor” causes “cancer cells die in 42 days” — refers to a regimen promoted by Rudolf Breuss. Wikipedia+2Cancer Ireland+2
Here’s a breakdown of what is known (and not known) about that claim:
✅ What is the claim and what is the idea behind it
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Breuss proposed what’s known as the Breuss Cancer Cure (or “Breuss 42-day juice fast/diet”). The idea: for 42 days, a person eats no solid food, consuming only a special vegetable juice plus some herbal teas. Wikipedia+2tiger.feji.io+2
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The juice recipe is reportedly: about 55% beetroot, 20% carrot, 20% celery root, small amounts of potato and/or radish. Telegrafi+2Indeksonline+2
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The logic given by Breuss: cancer cells allegedly “feed” on proteins from solid food, and if you deny them solid food for 42 days, the theory goes, the cancer cells would “starve” and die — while healthy cells survive on juice. Wikipedia+2Rose Rambles…+2
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Supporters sometimes claim that tens of thousands of people have “been cured” via this method. amg-news.com+2Indeksonline+2
⚠️ Why mainstream science and medicine reject this as a “cure”
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The fundamental assumption — that cancer invariably relies only on proteins from solid food, such that a juice-only, protein-free diet would kill cancer cells — lacks biological plausibility. Cancer is not one disease; there are many types, with differing biology. Wikipedia+1
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There is no credible clinical evidence (i.e. peer-reviewed studies or trials) showing that the Breuss method cures cancer or significantly prolongs survival. The stories of “cured patients” are anecdotal. New Gardenia+2Cancer Ireland+2
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Experts in medical science consider the Breuss approach a form of “alternative therapy” or “pseudoscience,” not a verified medical treatment. Wikipedia+1
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The “detox,” “juice cleanses,” or “immune-boosting” rhetoric often used to support such diets are scientifically shaky. For instance: the notion of a “general body detox” via juice has no real medical basis. Cancer Ireland
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Worse, for a person with cancer, a 42-day diet with no solid foods can lead to malnutrition, serious weight loss, electrolyte imbalance, weakened immune system — all of which can worsen overall health and make standard treatments less effective. New Gardenia+1
🧠 What credible science says about cancer and “cures”
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Science-Based Medicine (and similar scientific-medicine watchdogs) analyze such claims and find that they fall apart under scrutiny. For example: while raw juices (like from beetroot) may contain antioxidants or compounds beneficial for overall health, there is no evidence that drinking juice alone can “kill” cancer cells in people. Science-Based Medicine
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Cancer is complex: many types, many processes. Treatments that “work” need rigorous testing — cell-level lab studies don’t equal cures in humans. Even if a substance shows anti-tumor activity in petri dishes, it doesn’t guarantee safety or efficacy in humans.
✅ What are safer, evidence-based approaches
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For people diagnosed with cancer: follow treatment regimes recommended by qualified oncologists — based on surgery, chemotherapy, radiotherapy, immunotherapy — depending on type/stage of cancer.
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Maintain a healthy, balanced diet to support general well-being (but don’t rely on “miracle cures”).
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If you want to complement medical treatment with diet/nutrition advice, discuss with a qualified doctor or oncology-aware dietitian — never replace proven therapy with unproven diets.
🎯 My assessment of the claim
The claim that “juice kills cancer cells in 42 days” is almost certainly false. It is unsupported by credible scientific evidence and widely regarded by medical experts as a pseudoscientific cure — potentially dangerous if it diverts someone away from evidence-based treatments.