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

Scriptural Examples of Prayer and Fasting :

Moses – ‘Moses was there with the Lord 40 days and 40 nights; he did not eat bread or drink water. He wrote the Ten Commandments, the words of the covenant, on the tablets.’ (Exodus 34:28)

Jehoshaphat – ‘Jehoshaphat was afraid, and he resolved to seek the Lord. Then he proclaimed a fast for all Judah, who gathered to seek the Lord. They even came from all the cities of Judah to seek Him.’(2 Chronicles 20:3-4)

Ezra – ‘I proclaimed a fast by the Ahava River so that we might humble ourselves before our God and ask Him for a safe journey for us, our children, and all our possessions. (Ezra 8:21-23)

Esther – ‘Go and assemble all the Jews who can be found in Susa and fast for me. Don’t eat or drink for three days, day or night. I and my female servants will also fast in the same way. After that, I will go to the king even if it is against the law. If I perish, I perish.”’ (Esther 4:16)

Nineveh – ‘The men of Nineveh believed in God.  They proclaimed a fast and dressed in sackcloth—from the greatest of them to the least.  When word reached the king of Nineveh, he got up from his throne, took off his royal robe, put on sackcloth, and sat in ashes. Then he issued a decree in Nineveh: By order of the king and his nobles: No man or beast, herd or flock, is to taste anything at all. They must not eat or drink water.  (Jonah 3:5-10)

Jesus – ‘Then Jesus was led up by the Spirit into the wilderness to be tempted by the Devil.  After He had fasted 40 days and 40 nights, He was hungry. Then the tempter approached Him and said, “If You are the Son of God, tell these stones to become bread.”  But He answered, “It is written: Man must not live on bread alone but on every word that comes from the mouth of God.” (Matthew 4:1-4)

By Sarah Knapton, Science Correspondent

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.”