Proposed Metabolic Scope Theory links body mass, mtDNA GC content and temperature to maximum lifespan
The authors propose the Metabolic Scope Theory of Aging: maximum lifespan is treated as the time to exhaust mitochondrial bioenergetic reserve, and a relation using body mass, mtDNA GC content and body temperature explains about 69% of maximum-lifespan variance across 379 mammal species. [1]
Automatic summary · not editorially reviewed
The key findings
The authors propose the Metabolic Scope Theory of Aging, which treats longevity as the time to exhaust mitochondrial bioenergetic reserve rather than as a consequence of resting metabolic rate alone. [1]
Using body mass, mtDNA GC content and body temperature as proxies, the Scope–Stability–Pace relation explains about 69% of mammalian maximum-lifespan variance across 379 species. [1]
MSTA models cumulative mtDNA-linked damage as rising impedance within OXPHOS and predicts that interventions will be most effective when they relieve redox pressure or bypass constrained biosynthetic gates until therapies can directly restore mitochondrial conductance. [1]
The source at a glance
- Study type / format
- Proposed theoretical framework with comparative cross-species analysis (abstract)
- Population / context
- 379 mammalian species in the comparative analysis; cross-class comparisons including birds and ectotherms.
- Summary based on
- Study abstract
- Publication status
- Preprint · peer-review status not confirmed
- Original publication
- June 23, 2026
Proposed framework with three lifespan axes
The abstract proposes the Metabolic Scope Theory of Aging (MSTA). It treats longevity as the time needed to exhaust mitochondrial bioenergetic reserve, not as a result of resting metabolic rate alone. The framework splits lifespan into three axes: Scope, the reserve capacity that buffers cumulative damage; Stability, the resistance of mtDNA-linked OXPHOS architecture to erosion; and Pace, the temperature-dependent kinetics of lesion accumulation. This is a proposed framework, not a validated product.
Supporting source [1]
Body mass, mtDNA GC and temperature across 379 mammals
Using body mass as a Scope proxy, mtDNA GC content as a Stability proxy and body temperature as Pace, the authors report that the Scope–Stability–Pace relation explains about 69% of mammalian maximum-lifespan variance across 379 species. Cross-class comparisons are said to reinforce the same constraint structure: birds offset high thermal Pace through elevated mtDNA Stability, and the temperature coefficient derived from mammals matches the temperature dependence of lifespan seen in ectotherms. These are comparative associations, not causal demonstrations.
Supporting source [1]
Proposed impedance mechanism and its predicted limits
Mechanistically, MSTA models cumulative mtDNA-linked damage as rising impedance within OXPHOS. Increasing internal resistance is proposed to push mitochondria toward a high-redox-pressure, low-current regime that preserves basal ATP while restricting NAD+ regeneration, CoQ acceptor availability and Δp-dependent work. The earliest failure is therefore described not as energetic collapse but as loss of regenerative scope. MSTA separates a reversible, operational impedance from a fixed, informational one that sets the hard ceiling on lifespan. Because the informational layer is said to be irreversible by regulatory means, the framework predicts that until therapies can directly restore mitochondrial conductance, interventions will work best when they relieve redox pressure or bypass constrained biosynthetic gates. These are predictions of a proposed framework.
Supporting source [1]
How to interpret this
This is an abstract; the full text was not reviewed. The theory is a proposal, and the reported variance explained and cross-class comparisons are associations, not causal evidence. The mechanistic impedance model and intervention predictions are not tested outcomes in this abstract.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Lehmann G, Greenman Y, Shtrom I, Anis Y, Lehmann J, Stern N, Shefer G. · europepmc.org · June 23, 2026