Fasting for Nourishment?

Dr. Weeks’ Comment:   All cultures – religious or otherwise – encourage fasting (as well as feasting) but the nutritional benefits of fasting are less well appreciated.  The energy drain and immune stress which introducing food into your mouth creates is well understood by physiologists and I have taught my patients over the years that the most dangerous thing they do every day is eat food.  Why?  Because whatever is incompletely digested works against our health. And today in America, with the 24/7 diet of fast food and  junk (Remember: there is no such thing as junk food, just junk which is mislabeled food) swallowed without consciousness and intent to “do justice” to the sacrifices which were offered all along the food chain, we just don’t digest well enough for the food to nourish ourselves.  Quality is rarely prioritized (organic, non-GMO is more expensive but well worth it)  and so Quantity rules (are you super sized?)  This is especially tragic when the uneducated and mis-informed oncologist and the dietician staff tell patients who entrusts them to help fight cancer:  “Any calorie  is a good calorie.”   This advice flies directly in the face of the facts of nourishment and immune stimulation.  Don’t they know that chemotherapy itself is MORE EFFECTIVE is the patient is fasting? 

“fasting can actually make cancerous cells more susceptible to chemotherapy”

Starvation-dependent differential stress resistance protects normal but not cancer cells against high-dose chemotherapy.

Proc Natl Acad Sci U S A. 2008 Jun 17;105(24):8215-20. Epub 2008 Mar 31.

Many other peer-reviewed scientific articles teach the same thing but if your oncologists offers you sweets, suggest he or she keep up with the literature!


This is more poetically suggested by St. John Cassian, “Stop eating while still hungry and do not continue until you are satisfied.”  


(Many thanks to Professor Michael B. for sending me this article below).


Fasting for three days can regenerate entire immune system, study finds

A person’s entire immune system can be rejuvenated by fasting for as little as three days as it triggers the body to start producing new white blood cells, a study suggests

Researchers say fasting “flips a regenerative switch” which prompts stem cells to create brand new white blood cells Photo: PEGAZ/Alamy

Fasting for as little as three days can regenerate the entire immune system, even in the elderly, scientists have found in a breakthrough described as “remarkable”.

Although fasting diets have been criticised by nutritionists for being unhealthy, new research suggests starving the body kick-starts stem cells into producing new white blood cells, which fight off infection.

Scientists at the University of Southern California say the discovery could be particularly beneficial for people suffering from damaged immune systems, such as cancer patients on chemotherapy.

It could also help the elderly whose immune system becomes less effective as they age, making it harder for them to fight off even common diseases.

The researchers say fasting “flips a regenerative switch” which prompts stem cells to create brand new white blood cells, essentially regenerating the entire immune system.

“It gives the ‘OK’ for stem cells to go ahead and begin proliferating and rebuild the entire system,” said Prof Valter Longo, Professor of Gerontology and the Biological Sciences at the University of California.

“And the good news is that the body got rid of the parts of the system that might be damaged or old, the inefficient parts, during the fasting.

“Now, if you start with a system heavily damaged by chemotherapy or ageing, fasting cycles can generate, literally, a new immune system.”

Prolonged fasting forces the body to use stores of glucose and fat but also breaks down a significant portion of white blood cells.

During each cycle of fasting, this depletion of white blood cells induces changes that trigger stem cell-based regeneration of new immune system cells.

In trials humans were asked to regularly fast for between two and four days over a six-month period.

Scientists found that prolonged fasting also reduced the enzyme PKA, which is linked to ageing and a hormone which increases cancer risk and tumour growth.

“We could not predict that prolonged fasting would have such a remarkable effect in promoting stem cell-based regeneration of the hematopoietic system,” added Prof Longo.

“When you starve, the system tries to save energy, and one of the things it can do to save energy is to recycle a lot of the immune cells that are not needed, especially those that may be damaged,” Dr Longo said.

“What we started noticing in both our human work and animal work is that the white blood cell count goes down with prolonged fasting. Then when you re-feed, the blood cells come back. So we started thinking, well, where does it come from?”

Fasting for 72 hours also protected cancer patients against the toxic impact of chemotherapy.

“While chemotherapy saves lives, it causes significant collateral damage to the immune system. The results of this study suggest that fasting may mitigate some of the harmful effects of chemotherapy,” said co-author Tanya Dorff, assistant professor of clinical medicine at the USC Norris Comprehensive Cancer Center and Hospital.

“More clinical studies are needed, and any such dietary intervention should be undertaken only under the guidance of a physician.”

“We are investigating the possibility that these effects are applicable to many different systems and organs, not just the immune system,” added Prof Longo.

However, some British experts were sceptical of the research.

Dr Graham Rook, emeritus professor of immunology at University College London, said the study sounded “improbable”.

Chris Mason, Professor of Regenerative Medicine at UCL, said: “There is some interesting data here. It sees that fasting reduces the number and size of cells and then re-feeding at 72 hours saw a rebound.

“That could be potentially useful because that is not such a long time that it would be terribly harmful to someone with cancer.

“But I think the most sensible way forward would be to synthesize this effect with drugs. I am not sure fasting is the best idea. People are better eating on a regular basis.”

Dr Longo added: “There is no evidence at all that fasting would be dangerous while there is strong evidence that it is beneficial.

“I have received emails from hundreds of cancer patients who have combined chemo with fasting, many with the assistance of the oncologists.

“Thus far the great majority have reported doing very well and only a few have reported some side effects including fainting and a temporary increase in liver markers. Clearly we need to finish the clinical trials, but it looks very promising.”




        HERE ARE MORE POSTS ARGUING FOR FASTING IF YOU ARE FIGHTING CANCER…/more-evidence-that-fasting-potentiates-chemotherapy/
Sep 12, 2012  Dr. Weeks’ Comment: Insulin potentiated chemotherapy is delivered in the context of the patient fasting. I have urged patients to fast before …
Feb 19, 2012  Dr. Weeks’ Comment: Fasting has a long history of benefit. As part of religious disciplines, it is widely used around the world. Now science tells ……/ipt-by-any-other-name-is-still-chemo-while-fasting/
Feb 9, 2012  Now we learn fasting potentates chemotherapy. Just say “No” to the candy, cookies and brownies offered to you during chemotherapy by the …
Metformin (or fasting!) for cancer treatment. Posted by Bradford S. Weeks, MD on April 19, 2010. Clin Cancer Res. 2010 Apr 13. [Epub ahead of print] …
Apr 26, 2012  Note that fasting (which is how our patients come for chemotherapy). and insulin ( which lowers blood sugar) both POTENTIATE the ……/these-simple-things-may-make-your-chemotherapy-work- better/
Nov 2, 2012  Even something as simple as fasting can make your chemotherapy MORE effective! We have known that for 5 years but… alas, oncologists still …

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