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At roughly 45, many bodies change course. Scientists looking at metabolites—small molecules that reflect activity within cells—found two pronounced spikes in molecular patterns: one in the mid-40s and another in the early 60s. The signal surprised researchers because it appeared in both men and women.
Study details and implications
Researchers applied metabolomic profiling to samples from adults aged 25 to 70. The first peak, around the mid-40s, roughly coincides with the average onset of menopause for many women. But the team argued that menopause alone cannot explain the change, because men showed a comparable molecular shift at the same age. Xiaotao Shen, a metabolomicist and the paper’s first author—formerly at Stanford and now at Nanyang Technological University in Singapore—summed it up bluntly: "This suggests that while menopause or perimenopause may contribute to the changes observed in women in their mid-40s, there are likely other, more significant factors influencing these changes in both men and women."
What could those factors be? Lifestyle transitions, cumulative exposures, or metabolic adaptations tied to midlife responsibilities and physiology are all plausible. The study itself, published in Nature Aging, is careful about claims. Sample sizes were modest, and only a limited set of biological specimens were analyzed. That constrains how broadly we can generalize the findings.
Despite those limitations, the pattern is worth attention. If midlife and early-sixties shifts are reproducible, they could mark windows when interventions yield outsized benefits—better-targeted screening, lifestyle counseling, or biomarker-driven therapies. The authors call for larger, more diverse cohorts and denser sampling across ages to tease apart cause and effect.
Small study. Big questions. The molecular story of midlife has only just begun to unfold.
Source: sciencealert
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