Cancer cells use exactly the same nutrients as any other cells in the body. Anecdotal, unverifiable stories aside, there is no way anyone’s diet is going to cure a cancer.
Let me be clear: I would not recommend a “diet cure” in place of conventional treatment for cancer, but diet can be an important part of avoiding or combating cancer. The medical evidence shows that a Mediterranean type low inflammation index diet and at least moderate physical activity reduces mortality from cancer and other causes. Moreover, cancer cells are by definition abnormal and do better with high glucose than with ketones and related compounds that the body produces for fuel during fasting and when on low glycolic diets. The old advice of “starve a fever” may be ill-founded, but “starve a cancer” may soon be common medical advice.