Age-associated molecular changes are deleterious and may modulate life span through diet

Area of Science:

• Gerontology
• Molecular Biology
• Comparative Biology

Background:

• Aging involves molecular changes like gene dysregulation and accumulated damage.
• The cumulative impact of these molecular changes on longevity is complex and influenced by multiple factors.
• Age-associated dietary components may influence lifespan in closely related species.

Purpose of the Study:

• To investigate whether age-associated molecular changes in diet causally affect lifespan.
• To determine if diets incorporating molecular extracts from older organisms impact longevity.
• To assess this effect across different species, including yeast, fruit flies, and mice.

Main Methods:

• Utilized species-specific culture media and diets.
• Incorporated molecular extracts from both young and old organisms into diets.
• Compared the influence of these experimental diets on the lifespan of yeast, fruit flies, and mice.

Main Results:

• Diets derived from older organisms consistently shortened lifespan in at least one sex across all tested species.
• This effect was observed in yeast, fruit flies (Drosophila melanogaster), and mice (Mus musculus).
• Demonstrated a deleterious impact of 'old' diets on organismal longevity.

Conclusions:

• Age-associated molecular changes, including cumulative damage and altered dietary composition, are detrimental to lifespan.
• These findings suggest a causal link between dietary aging markers and the aging process itself.
• Dietary intake of age-associated molecular changes can negatively affect longevity.