Thursday, 08 August 2024

Healthy ageing with fasting: Spermidine is the key to success

Older lady with glasses makes a heart with her fingers and looks through it ©Teodor Lazarev - stock.adobe.com

Healthy into old age: Fasting contributes to this because the spermidine concentration in the body increases as a result of abstaining from food. This triggers a cellular cleansing process. Photo: Teodor Lazarev - stock.adobe.com

In most parts of the world, life expectancy has risen significantly in recent decades. At the same time, various age-related diseases have increased. Fasting appears to be a promising preventative measure. A few years ago, scientists in Graz were able to prove its health-promoting effects. Now an international research team led by Sebastian Hofer and Frank Madeo from the University of Graz has discovered which molecular mechanisms underlie the positive effects: During fasting, the concentration of the substance spermidine increases in the body, which triggers autophagy, a cellular cleansing process. The current study was published in the renowned scientific journal Nature Cell Biology.

Spermidine has it all. Over the last ten years, researchers in Graz have been able to prove that the natural substance protects the heart and can stop age-related memory loss, among other things. The current study now shows that the spermidine concentration increases significantly in fasting humans, mice, flies and yeast cells. This stimulates autophagy, a cellular cleaning programme. Cellular waste produced during the ageing process is broken down. "With spermidine, we have found an important building block for the health-promoting effects of fasting," says Frank Madeo, emphasising the significance of the latest publication.

The study authors were able to observe an increase in fitness as well as an extension of health and lifespan in all of the organisms studied as a result of the fasting processes, as long as they were accompanied by an increase in spermidine concentration. "After we prevented the spermidine increase in various model organisms through chemical and genetic interventions, they were no longer able to trigger autophagy and the vitality-enhancing effect of fasting failed to materialise," reports Madeo.

Chronic inflammation is a significant accelerator of the ageing process. "In model organisms that suffered from arthritis, the inflammation improved with regular fasting. However, only if they were also able to produce spermidine," explains Sebastian Hofer, now a researcher at the Max Delbrück Centre in Berlin, using an example. The same applies to the heart-protective effects of fasting processes. "Additional doses of spermidine could possibly make various fasting regimes even more effective," Hofer surmises.

The research is part of BioHealth, a field of excellence at the University of Graz.

Publication
Spermidine is essential for fasting-mediated autophagy and longevity
Frank Madeo, Sebastian Hofer et al.
Nature Cell Biology, 8 August 2024
DOI: 10.1038/s41556-024-01468-x

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