Major liver surgery places extraordinary demands on the body.
Although the liver is famous for its ability to regenerate, rebuilding lost tissue requires huge amounts of energy, healthy cells, and careful coordination inside the organ.
Scientists are increasingly exploring whether they can strengthen the liver before surgery instead of focusing only on recovery afterward.
A new study from researchers at the State University of Campinas (UNICAMP) in Brazil suggests that a common nutritional supplement called HMB may help do exactly that.
The research, published in Acta Physiologica, found that mice given HMB before surgery developed livers that were better able to cope with a second serious injury after regeneration.
HMB is produced naturally from leucine, an amino acid obtained from protein-containing foods. Because the body converts only a small percentage of leucine into HMB, supplements are widely sold to support muscle health, particularly in older adults.
While its muscle benefits have generally been modest, scientists wondered whether HMB might have a larger effect on the liver because that is where it is mainly produced.
To investigate, the research team supplemented mice with HMB for 10 consecutive days before surgery. The amount was similar to the dose commonly used by adults taking HMB supplements. Once surgery began, supplementation ended completely.
The researchers removed approximately seventy percent of the liver, creating a well-established model for studying regeneration. Within seven days, both groups had replaced most of the lost liver tissue, confirming the liver’s remarkable natural healing ability.
The story became much more interesting after regeneration was complete. Researchers deliberately exposed the regenerated livers to a toxic dose of acetaminophen, a medication that can cause severe liver injury when taken in excessive amounts. This additional challenge allowed the scientists to test how well the regenerated organ actually functioned.
The mice that had previously received HMB performed much better. Their liver tissue showed fewer signs of injury, healthier cellular energy production, and stronger evidence of effective repair.
The researchers found that mitochondria, often called the cell’s powerhouses, remained healthier in these animals. Because mitochondria generate the energy needed for healing, preserving their function may explain why the liver responded more successfully to a second injury.
Perhaps the most surprising observation was that HMB no longer needed to be present for these benefits to appear. The supplement had been discontinued before surgery, yet its protective effects remained nearly three weeks later. This finding suggests HMB may condition the liver in advance, allowing it to better tolerate future stress.
The researchers describe this as a possible form of metabolic conditioning. Similar approaches are already used in some areas of medicine, where patients receive treatments before surgery to improve recovery. Nutritional preparation could eventually become another strategy if future research confirms these results.
Despite the encouraging findings, the investigators caution against drawing conclusions for patients too soon. This was an animal experiment, and many biological differences exist between mice and humans. The study also focused on liver function after surgery rather than long-term clinical outcomes such as survival or recovery time.
Even so, the work opens an interesting direction for future research. Because HMB is already commercially available and generally considered safe when used appropriately, researchers may be able to move more quickly into carefully designed human clinical trials.
Those studies will need to determine whether preoperative HMB truly improves liver recovery and whether the same biological effects occur in people undergoing liver surgery.
Study analysis: This is an innovative preclinical study that shifts attention from the speed of liver regeneration to the quality of regenerated tissue. The additional stress test strengthened the findings by showing functional benefits rather than simple tissue regrowth.
Nevertheless, the evidence remains experimental, and clinical recommendations cannot be made until human trials confirm safety, effectiveness, and optimal dosing.
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