Metabolic Communication and Healthy Aging: Where Should We Focus Our Energy?

Aging is associated with a loss of metabolic homeostasis and plasticity, which is causally linked to multiple age-onset pathologies. The majority of the interventions—genetic, dietary, and pharmacological—that have been found to slow aging and protect against age-related disease in various organisms do so by targeting central metabolic pathways. However, targeting metabolic pathways chronically and ubiquitously makes it difficult to define the downstream effects responsible for lifespan extension and often results in negative effects on growth and health, limiting therapeutic potential. Insight into how metabolic signals are relayed between tissues, cells, and organelles opens up new avenues to target metabolic regulators locally rather than globally for healthy aging. In this review, we discuss the pro-longevity effects of targeting metabolic pathways in specific tissues and how these interventions communicate with distal cells to modulate aging. These studies may be crucial in designing interventions that promote longevity without negative health consequences. Multiple metabolic pathways can be manipulated to slow the rate of aging, but doing so ubiquitously can have negative physiological consequences. Smith et al. review evidence that targeting central age-related metabolic pathways in specific tissues can promote healthy aging and might circumnavigate detrimental effects. [ABSTRACT FROM AUTHOR]