When Mitochondria Keep Signaling but the Body Can’t Recover

What Picard (2022) and a new Molecular Cell review get right—and what they still miss

For a long time, mitochondria were taught as simple “power plants”: make ATP, keep the lights on, move along.

That story is now clearly outdated.

Over the past few years, a new view has emerged—one that sees mitochondria as communication hubs that sense stress, coordinate responses, and signal to the rest of the cell and body. Two influential works sit at the center of this shift:

• Martin Picard’s 2022 framework on mitochondrial signal transduction

• A 2026 Molecular Cell review by Meichsner and colleagues on mitochondria as sources and targets of cellular signaling

Together, they paint a compelling picture.

But they also leave an important clinical question unanswered.

What these papers get exactly right

Mitochondria are not passive

Both works clearly show that mitochondria:

• Sense metabolic, redox, inflammatory, and proteostatic stress

• Integrate signals from the nucleus, immune system, and environment

• Actively signal back using metabolites, reactive oxygen species, peptides, RNA, and even fragments of mitochondrial DNA

In other words, mitochondria don’t just fail in disease—they respond.

Stress signaling is not automatically “bad”

A key insight from both Picard (2022) and the new review is that:

• Mitochondrial stress responses (like ISR and UPRmt) are adaptive

• They are meant to buy time, preserve function, and maintain survival

• Outcomes depend on duration, intensity, and context

This helps explain why stress biology, inflammation, and aging are so tightly linked—without reducing everything to “damage accumulation.”

Persistent signaling is common in chronic disease

Both papers describe situations where:

• Stress signaling stays switched on

• Inflammation becomes low-grade but chronic

• Cells remain metabolically active but fragile

• Senescence, immune activation, and transcriptional overdrive coexist

This already challenges the idea that chronic disease is simply “broken pathways.”

The question they don’t fully answer

Here’s the gap that remains:

Why does mitochondrial signaling persist even when recovery does not happen?

Both frameworks describe the signals in great detail.

Neither clearly names the limiting factor that determines whether signaling leads to recovery—or to exhaustion.

They tell us how cells respond to stress, but not why those responses eventually stop working.

The missing concept: bioenergetic throughput

This is where Exposure-Related Malnutrition (ERM) enters the picture.

ERM is not about calories, vitamins, or single deficiencies.

It describes a state where:

• The body remains metabolically and transcriptionally active

• Stress signaling continues (often intensely)

• But bioenergetic throughput—ATP availability, redox balance, substrate flow, repair capacity—has become constrained

In simple terms:

The system is still sending instructions,but it no longer has enough energy to carry them out.

Signaling without execution

Seen through this lens, many phenomena described in Picard (2022) and the 2026 review take on new meaning:

• Chronic ISR or UPRmt → adaptive programs that cannot complete

• Persistent inflammation → immune signaling without resolution

• Elevated stress hormones → mobilization without rebuilding

• Epigenetic drift → transcriptional activity under energetic constraint

Nothing is “off.”

Everything is overworked.

ERM reframes chronic illness and aging

ERM proposes that many chronic conditions reflect:

• Adaptation without recovery

• Compensation without replenishment

• Signaling without throughput

This explains why:

• More interventions don’t always help

• Supplement stacking often fails

• Patients feel “wired but tired”

• Lab markers can look active while resilience declines

And crucially, it explains why restoring recovery capacity must come before optimization.

Completing the mitochondrial signaling story

Picard (2022) gave us the language of mitochondrial communication.

The Molecular Cell review gives us the molecular wiring.

ERM adds the final piece:

A governing constraint.

Not every signal can be acted on.

Not every adaptation can be sustained.

And not every stressed system should be pushed harder.

Sometimes, the most important intervention is not to activate more pathways—but to restore the energy required to resolve them.

Bottom line

You’re not broken.

Your mitochondria may still be talking.

But without sufficient bioenergetic capacity, the message can’t become recovery.

That’s not failure.

That’s exhaustion—and it’s reversible.

Meichsner, A., Bader, V., & Winklhofer, K. F. (2026). Mitochondria as sources and targets of cellular signaling. Molecular Cell, 86(3), 1–19. https://doi.org/10.1016/j.molcel.2026.01.008

Picard, M. (2022). Mitochondrial signal transduction. Cell Metabolism, 34(11), 1620–1653. https://doi.org/10.1016/j.cmet.2022.10.008