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American Focus > Blog > Tech and Science > Study Reveals Critical Age When Your Thinking Begins to Decline : ScienceAlert
Tech and Science

Study Reveals Critical Age When Your Thinking Begins to Decline : ScienceAlert

Last updated: March 11, 2025 1:09 am
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Study Reveals Critical Age When Your Thinking Begins to Decline : ScienceAlert
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Researchers Identify Critical Midlife Window for Brain Health

As Shakespeare eloquently stated, life is a stage with entrances and exits, and researchers have pinpointed a significant moment in middle-age when our brain cells begin to show signs of decline. Based on brain scans and extensive testing of 19,300 individuals, the average age at which this degeneration becomes apparent is around 44 years old. This marks the beginning of a downward slope that accelerates rapidly by age 67, eventually leveling off by the time we reach 90.

The team of researchers, led by experts from Stony Brook University in the US, believes that these findings could offer valuable insights into promoting better brain health as we age. Understanding the precise timing and mechanisms of brain aging acceleration provides strategic opportunities for intervention to prevent irreversible damage.

Neuron stress
The researchers looked at the reaction of neurons to stress. (Antal et al., PNAS, 2025)

Neuroscientist Lilianne Mujica-Parodi from Stony Brook University explains, “We’ve identified a critical mid-life window where the brain begins to experience declining access to energy but before irreversible damage occurs, essentially the ‘bend’ before the ‘break’.”

The researchers also discovered a potential key factor driving this decay: neuronal insulin resistance. As we age, insulin becomes less effective in neurons, leading to reduced glucose uptake for energy and disrupting brain signaling. Genetic analysis supported the idea that metabolic changes influence brain aging, with activity related to glucose-absorbing protein GLUT4 and fat-transporting protein APOE correlating with signs of wear and tear on the brain.

By addressing the issue of insufficient fuel for neurons during mid-life, researchers believe that it may be possible to slow down brain aging and offer new treatment options for neurodegenerative diseases. A study involving 101 individuals who were given ketone supplements, known to enhance insulin sensitivity and mitigate metabolic damage in brain cells, showed promising results in stabilizing brain degradation, particularly in middle-aged individuals.

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Neuroscientist Botond Antal emphasizes the importance of this research in shifting the focus towards proactive brain health interventions rather than waiting for cognitive symptoms to appear. By identifying individuals at risk through neurometabolic markers and intervening during the critical midlife window, it may be possible to prevent substantial damage and preserve brain function.

This groundbreaking research has been published in PNAS and offers a new perspective on brain aging prevention and treatment strategies.

TAGGED:agebeginsCriticaldeclineRevealsScienceAlertStudyThinking
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