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Valine is an essential amino acid the body relies on to make proteins and support normal growth and tissue repair. Unlike some other amino acids, it cannot be produced naturally by the body, so it has to be consumed through food. A new study found that restricting dietary valine extended both in male mice while improving overall healthspan in both male and female mice.
Emerging evidence suggests that protein’s effects on health are influenced by its individual amino acid components, not just the total amount of protein consumed. Researchers have identified the branched-chain amino acids leucine, isoleucine, and valine as key players. Earlier studies showed that restricting all three improved metabolic health and extended male mouse lifespan, but the effects of reducing valine alone have remained largely unexplored.
The study team placed young male and female mice on either a control diet or a diet with two-thirds less valine and remained on these diets throughout their lives. Researchers carefully matched the diets for calories, fat, carbohydrates, and total amino acid content, replacing the missing valine with non-essential amino acids which the body can make on its own.
Cutting dietary valine produced a striking longevity effect in male mice. Animals on the low-valine diet lived an average of 959 days compared with 777 days for controls, a 23.4% increase. Even the longest-lived mice benefited, with the top survivors in the valine-restricted group living about 15% longer than the longest-lived control mice, pointing to a true extension of lifespan.
The effects of valine restriction were stronger in males, while female mice showed little to no change in median lifespan. This difference reflects a broader pattern in aging research, where interventions often produce sex-specific outcomes. Although lifespan extension in both sexes is uncommon, researchers believe females may still benefit from valine restriction in certain settings.
The study provides the first evidence that valine restriction can extend lifespan in mice and that the response may be sex-specific. Beyond longevity, researchers found that reducing valine improved healthspan in both male and female mice. They also identified unexpected biological changes, including increased liver mTOR signaling in males and enhanced mitochondrial activity, which could play a role in the lifespan extension.
To view the original scientific study click below:
Lifelong restriction of dietary valine has sex-specific benefits for health and lifespan in mice
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