Researchers report that biological changes during refeeding—not fasting itself—may drive longevity benefits observed in laboratory models.
By yourNEWS Media Newsroom
New research has identified a key biological mechanism that may explain how fasting and calorie restriction extend lifespan, pointing to metabolic changes that occur after fasting rather than during it.
The study, conducted by scientists at UT Southwestern Medical Center and published in Nature Communications, found that the transition back to eating—known as refeeding—plays a central role in activating longevity pathways. The findings were based on experiments using Caenorhabditis elegans, a commonly studied laboratory organism.
Lead researcher Peter Douglas said the results shift attention to a previously underexplored phase of metabolism.
“Our discoveries shift the focus toward a neglected side of the metabolic coin—the refeeding phase,” Douglas said. “Our data suggest that the health-promoting effects of intermittent fasting are not merely a product of the fast itself, but are dependent on how the metabolic machinery recalibrates during the subsequent transition back to a fed state.”
During fasting, the body switches from using glucose to breaking down stored fats for energy. This process is regulated by a protein known as NHR-49, which activates lipid metabolism when energy from carbohydrates becomes unavailable.
Researchers found that for lifespan extension to occur, NHR-49 must later be deactivated during refeeding. This shutdown is triggered by another molecule, KIN-19, which modifies the protein through a process known as phosphorylation.
In experiments where scientists prevented NHR-49 from turning off, the lifespan-extending effects of fasting were eliminated, indicating that proper metabolic resetting is essential.
Unexpectedly, worms genetically modified to lack NHR-49 still experienced a roughly 41 percent increase in lifespan following fasting. The finding suggests that mechanisms activated during refeeding may operate independently of the initial fat-burning process.
The study also observed behavioral improvements in older organisms following fasting, including increased movement, indicating potential effects beyond lifespan alone.
Researchers said the results could have broader implications for human health if similar pathways are identified in higher organisms. Douglas said targeting the molecular switch between fasting and refeeding could eventually allow scientists to replicate the benefits of calorie restriction without requiring strict dietary changes.
“Our findings bridge a gap between lipid metabolism and aging research,” he said. “By targeting aging, the single greatest risk factor for human disease, we move beyond treating isolated conditions toward a preventive model of medicine that enhances quality of life.”
The research adds to existing evidence that fasting-related metabolic changes are associated with cellular repair processes, improved immune function, and enhanced DNA maintenance. These biological responses have been linked in prior studies to reduced risk of chronic diseases.
Further studies are expected to examine whether the same metabolic pathways identified in laboratory organisms are present in mammals, including humans.
The findings highlight the role of metabolic transitions in aging and suggest that the timing and regulation of nutrient intake may be as important as caloric restriction itself in influencing long-term health outcomes.
Watch the video below that talks about practical tips on cleansing and fasting.
This video is from the BrightU Series Snippets channel on Brighteon.com.
Source: Natural News
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