Patterns of Aging Changes in Bodyweight May Predict Alzheimer's Disease

Area of Science:

• Gerontology
• Neurodegenerative Diseases
• Metabolic Health

Background:

• The relationship between body weight changes during aging and the risk of developing late-onset Alzheimer's disease (AD) remains unclear.
• This study investigates age-trajectories of body weight in relation to AD development.
• Key factors examined include age at maximum weight (AgeMax) and the rate of weight decline.

Discussion:

• Women with late-onset AD exhibited significantly lower body weight starting several decades prior to disease onset.
• Individuals who developed AD also experienced their maximum weight approximately 10 years earlier than those who remained AD-free.
• The presence of the APOE4 gene variant was associated with an earlier AgeMax and a steeper decline in body weight.

Key Insights:

• An earlier AgeMax and a steeper slope of weight decline are associated with an increased risk of late-onset AD.
• Conversely, a later AgeMax and a flatter slope of weight decline predict a lower risk of AD.
• These findings suggest that premature weight decline may indicate accelerated physical aging, potentially contributing to AD pathogenesis.

Outlook:

• Further research is warranted to elucidate the precise mechanisms linking body weight dynamics and AD.
• Investigating interventions targeting metabolic health and aging processes could offer novel strategies for AD prevention.
• Longitudinal studies incorporating detailed metabolic and aging markers are needed to confirm these associations.