I have found that when I'm in full nutritional ketosis, the time between my phlebotomies can increase from 4-weeks to up to five months! A diet that puts you in nutritional ketosis is very low in carbohydrates and sugar in any form. You should consult with your medical care team before making a significant change to your diet to ensure that it is safe for you to do. This has been my personal experience and your milage may vary, but it does tend to make sense that you deprive the cancer of the food sources that feed it it will slow the blood production down.