Simple-minded. That may slow, delay or avoid run-away growth &amp; metastasis (of many not all cancers) but not any&amp;all unwanted growths, because blood glucose never can go to 0. Cancer cells once sufficiently isolated from the immune system also love glutamine, other amino acids and vitamins. How long do you want to restrict all those? Ever heard of cachexia? With no food coming in, nutrients from the blood get scavenged by the baddies as bodily reserves are depleted. What then?