Fasting-like diets can reverse aging process: study

By Imogen Howse via SWNS

Diets that mimic fasting may be able to make a person "two-and-a-half years younger" by reducing their biological age, according to a new study.

Researchers found that a fasting-mimicking diet (FMD) can lower insulin resistance, reduce liver fat, and slow immune system aging.

It can also decrease the risks of age-related illnesses, such as cancer, diabetes, and heart disease.

When these benefits are combined, this fasting-like diet can result in a lower biological age for humans.

Created by a laboratory at the USC Leonard Davis School of Gerontology in California, US, the ‘FMD’ is a five-day diet which is high in unsaturated fats and low in overall calories, protein, and carbohydrates.

It is designed to mimic the effects of a water-only fast while still providing the necessary nutrients.

The style of fasting is also supposed to make it easier for people to follow and stick to this kind of diet in practice.

Senior author Professor Valter Longo said: “This is the first study to show that a food-based intervention that does not require chronic dietary or other lifestyle changes can make people biologically younger.

“This is based on both changes in risk factors for aging and disease, and on a validated method developed to assess biological age.”

Prof. Longo and his team analyzed the effects of the FMD in two clinical trial populations – each with men and women between the ages of 18 and 70.

Participants underwent three to four monthly cycles of the FMD, during which they adhered to the diet for five days and then ate a ‘normal’ diet for 25 days.

While sticking to the FMD, they ate things like plant-based soups, energy bars, energy drinks, crisps, and tea – all of which were portioned out over the five days.

They were also given a supplement which provided high levels of minerals, vitamins, and essential fatty acids.

Meanwhile, a control group was instructed to eat either a ‘normal’ or Mediterranean-style diet – which is what the FMD participants ate in their ‘time-off’.

Results, published in the journal Nature Communications, revealed that those in the FMD group had lower risk factors for diabetes, including less insulin resistance and lower HbA1c levels.

They also had decreased abdominal and liver fat – which is associated with a reduced risk of metabolic syndrome – and an increased lymphoid-to-myeloid ratio, which is an indicator of a more youthful immune system.

Further statistical analysis of both clinical studies also showed that the FMD participants had reduced their biological age by two and a half years on average.

‘Biological age’ is a measure of how well a person’s cells and tissues are functioning, as opposed to chronological age.

“This study has shown for the first time evidence of biological age reduction from two different clinical trials, accompanied by evidence of rejuvenation of metabolic and immune function,” Prof Longo said.

First author Professor Sebastian Brandhorst added: “Our study also lends more support to the FMD’s potential as a short-term, periodic, achievable dietary intervention that can help people lessen their disease risk and improve their health without extensive lifestyle changes.”

The research team from USC Leonard Davis hopes that their findings will encourage more doctors across Europe and the US to recommend the FMD to patients with higher disease risk factors, as well as to typically 'healthy' people who may be interested in the other benefits – including ‘younger age’.

Previous research by Prof. Longo has indicated that brief, periodic FMD cycles can promote stem cell regeneration and lessen chemotherapy side effects.

Meanwhile, trials on mice have found that the FMD can reduce the signs of dementia.

However, the new study was the first to demonstrate the effects of the FMD on insulin resistance, liver fat, immune system aging, and biological age.