Dr. Budwig wrote a cookbook called “Krebs, ein Fettproblem” [“Cancer, A Fats Problem”] and recommends: “For oils we mostly use flax oil, sunflower oil, walnut oil, soy oil and corn oil.”
She always refers to natural cold-pressed and unprocessed oils. She writes in the book “Cancer – The Problem and the Solution” that “the fatty acid found in olive oil is not considered essential.”
In her book “Fettfibel” she somewhat qualifies her stance by writing: “…natural unprocessed olive oil is valuable. When travelling in the south [of Europe], I’d prefer olive oil over the numerous artificial products of ‘modern hotel cuisine.’”
Dr. Budwig writes in her Oil-Protein Cookbook which neither mentions nor recommends olive oil: ”This ‘oil-protein diet’ cookbook represents the strict form of this diet, limited to the optimum foods. This cookbook helps the ill person and those who wish to assist them.”
So, in conclusion, olive oil is not harmful of course, however in harmony with Dr. Budwigs findings people with cancer are best to favor cold pressed sunflower and walnut oil and of course the flaxseed oil which is commonly used in the muesli mixture.