Declining levels of a brain protein called Menin may act as a hidden driver of aging, according to a new study in mice. Researchers found that restoring Menin or giving a simple amino acid supplement reversed several signs of aging, including memory problems.
The Research
Scientists at Xiamen University in China, led by Lige Leng, published findings in PLOS Biology on May 24, 2026. They discovered that Menin levels drop sharply in the hypothalamus as mice age. This loss triggered inflammation, thinning skin, lower bone mass, impaired balance, memory decline, and a shorter lifespan.
When the researchers delivered the Menin gene into the hypothalamus of elderly mice (about 20 months old), learning, memory, balance, skin thickness, and bone density all improved within 30 days. The treatment also boosted D-serine, an amino acid neurotransmitter important for learning and memory.
Separately, three weeks of D-serine supplementation improved cognitive performance in older mice but did not affect physical aging markers like skin and bone.
Why It Matters
This study highlights the hypothalamus as a master regulator of aging. The fact that a single protein can trigger such widespread effects suggests that brain health may be central to how our bodies age. D-serine, found naturally in foods like soybeans, eggs, and nuts, is already available as a supplement, though human trials are needed.
What You Can Do
While these findings are preliminary, they reinforce the importance of brain health for overall aging. Eating a balanced diet rich in amino acids and engaging in cognitive stimulation may support your brain's resilience.
Source: ScienceDaily Mind & Brain
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