A considerable number of patients with cancer have used or are using the Gerson therapy, an alleged anticancer metabolic diet. However, there is almost no scientific support for this regimen. Hence, the present case review study of 6 patients with metastatic cancer who used the Gerson therapy aims at critically evaluating each case to derive some valid interpretations of its potential effect. All 6 cases had a cancer diagnosis with poor prognosis. Despite the presence of some confounding variables, it seems that the Gerson regimen has supported patients to some extent both physically and psychologically. More scientific attention needs to be directed to this area so that patients can practice safe and appropriate therapies that are based on evidence rather than anecdotes.