No. There is no evidence the Budwig Diet can cure cancer. There are no research studies demonstrating a Budwig Diet is superior to a normal, healthy diet for improving outcomes or survival in cancer patients.
ClinicalTrials.gov currently does not list any ongoing investigations on the Budwig Diet and cancer outcomes of following that diet.
There are case reports that some alternative cancer diets can be harmful for cancer patients because they contribute to malnutrition. For many people with cancer, a restrictive alternative diet such as Budwig can worsen symptoms and side effects of treatment.