The thyroid performs a delicate chemical task every day. To make the hormones that help regulate metabolism, it produces hydrogen peroxide—a reactive molecule that can also damage living tissue. Healthy function therefore depends on producing enough peroxide, using it in the right place, and preventing excess oxidation. This offers a useful perspective on thyroid disease. Alongside questions about iodine intake and immune activity, we should ask: Can the thyroid sustain the p

What David Nicholls’ commentary teaches us about mitochondrial function—and how it connects with bioenergetic impedance When we talk about cellular energy, we often focus on what is available: glucose, fat, nutrients, oxygen, or ATP. But availability answers only part of the question. We also need to understand how effectively these resources move through the processes that sustain biological work. A commentary by established mitochondrial bioenergeticist David G. Nicholls br

Beyond autoimmunity: A bioenergetic perspective on environmental exposures, oxidative stress, immune regulation, and progressive thyroid failure A newly published review in The Lancet Diabetes & Endocrinology, “Hashimoto’s thyroiditis: two decades on,” by Leonidas Duntas and Grigoris Effraimidis (2026), provides a timely synthesis of how our understanding of autoimmune thyroid disease has evolved. The review brings together genetics, environmental exposures, immune dysregulat

New research reveals divergent immune-aging trajectories. Together with earlier findings on reversible immunosenescence, it offers new insights into how cumulative exposure, bioenergetic strain, and incomplete recovery may drive biological aging. Aging is commonly described as the gradual accumulation of cellular damage. Mitochondria become dysfunctional, DNA damage accumulates, inflammation persists, and senescent cells increasingly interfere with tissue function. But an imp

Beyond hormonal decline: How cumulative stress, bioenergetic constraints, and declining recovery capacity may shape the transition into menopause and later-life health. Menopause is commonly described as the end of a woman's reproductive years, when ovarian follicles become depleted, estrogen production declines, and menstruation eventually stops. But this explanation leaves a more fundamental question unanswered: Why does the body's capacity to maintain ovarian function prog

A Bioenergetic Perspective on Chronic Tinnitus: From auditory stress and allostatic triage to compensatory brain networks, incomplete recovery, and biological hysteresis Tinnitus is often described as hearing a sound that does not exist in the external environment—a ringing, buzzing, or humming that can persist even in silence. But why does a temporary auditory disturbance sometimes become a chronic experience? And why does the brain continue responding to a signal that serve

Could Incomplete Recovery and Bioenergetic Constraints Explain Chronic Sensitisation? What a new Lancet review reveals about neuroimmune–neurovascular signalling—and why chronic iron deficiency may offer clues to the biology of migraine recovery. Migraine is commonly understood as a neurological disorder characterised by recurrent headaches, often accompanied by nausea, vomiting, sensitivity to light and sound, and sometimes visual disturbances. Yet the headache itself may be

A new review in Aging Cell proposes an intriguing way to think about aging. Rather than focusing only on mitochondrial dysfunction, vascular aging, or molecular hallmarks in isolation, Donega and colleagues follow oxygen through the entire physiological journey—from the atmosphere to the mitochondria—and ask what happens when the ability to maintain that flow progressively deteriorates. They call the framework “Oxygenaging.” Its central idea is that aging is associated not si

When the Brain Can No Longer Keep Up For decades, Alzheimer’s disease has largely been told as a molecular story: amyloid-β accumulates, Tau pathology follows, neurons degenerate, and cognition declines. A new Nature review by Bart De Strooper and Eric Karran proposes a more dynamic picture. Rather than treating Alzheimer’s disease as a uniform linear cascade, they argue that the disease unfolds through distinct biological phases separated by inflection points. At these thres

What a New Mitochondrial Transporter Reveals About Cycling, Congestion, and Bioenergetic Impedance We often talk about metabolism as if it were a collection of separate pathways: glucose is burned, fat is stored, fat is oxidized, mitochondria make ATP. But metabolism is not a set of isolated reactions. It is flow. Carbon must enter cells, move between compartments, cycle through biochemical pathways, cross mitochondrial membranes, be transformed, exported, recycled, and event

We usually think of adipocytes as storage cells. They take up excess energy, package it into triglycerides, and release fuel when the body needs it. In obesity, the conventional story then runs in the opposite direction: adipocytes become too large, inflammation develops, insulin resistance follows, and metabolic disease emerges. A new Cell Metabolism Perspective by Julia Zinngrebe, Konstantin Sparrer, and Pamela Fischer-Posovszky invites us to look at adipocytes very differe

More than 20 years ago, Michael MacDonald and colleagues published a perspective that challenged a simple view of mitochondrial metabolism in pancreatic β-cells. The conventional story was straightforward: glucose enters the cell, mitochondria oxidize it, ATP rises, ATP-sensitive potassium channels close, calcium enters, and insulin is released. MacDonald and colleagues argued that this was only part of the story. Their central observation was striking. In glucose-stimulated

Inflammation is often described as something that should be reduced. But biologically, inflammation is not inherently pathological. It is part of how the body responds to infection, injury, metabolic disturbance, and other forms of stress. The more important question may be: Can the inflammatory response finish its job and resolve? A recent review by Melo-Florián and Melo-Ramírez reframes inflammaging—the chronic, low-grade inflammatory state associated with aging—as much mor

For decades, lactate was treated mainly as a waste product of strenuous exercise. That view has changed dramatically. Lactate is now understood as an energy substrate, a signaling molecule, a regulator of blood flow and inflammation, and potentially even an epigenetic messenger. A new 2026 review by Ablitip and colleagues brings these ideas together in an intriguing framework they call the “Lactate Nexus.” Their central proposal is that lactate may provide a molecular bridge

For decades, aging research has largely focused on what goes wrong with time: DNA damage accumulates, mitochondria become less efficient, proteins lose quality control, inflammation becomes persistent, stem cells lose regenerative capacity, and senescent cells accumulate. The hallmarks of aging framework helped organize these changes into a coherent biological map. But a deeper question is now becoming increasingly important: Why do these changes persist? Perhaps aging is not

Stress is not automatically harmful. In fact, much of biology depends on the ability to detect a challenge, temporarily redirect resources, and then return toward normal function. The problem begins when that return never fully happens. Two recent reviews—one on the integrated stress response (ISR) and another on PERK and endoplasmic reticulum (ER) stress in aging—help explain how this transition may occur at the cellular level. Together, they describe a remarkably coherent s

What muscle biology, bioenergetics and the protein leverage hypothesis tell us about regular protein intake—and why some protein myths need updating For decades, discussions about protein have tended to fall into two extremes. One side treats protein mainly as a bodybuilding nutrient: useful if you want bigger muscles, but otherwise easy to get enough of. The other warns that eating “too much” protein may chronically activate growth pathways, accelerate ageing, increase cance

For much of modern aging research, one of the most influential ways to think about aging has been through the Hallmarks of Aging: genomic instability, telomere attrition, epigenetic alteration, loss of proteostasis, mitochondrial dysfunction, cellular senescence, altered nutrient sensing, and other processes that become increasingly disturbed with age. This framework has been enormously useful. It gave aging biology a common language and helped organize a field that was previ

Most laboratory reports are designed around a simple question: is the result inside or outside the reference interval? That distinction is clinically useful. A markedly abnormal glucose level, inflammatory marker, liver enzyme, or renal marker deserves attention. But biology does not suddenly change at the exact boundary printed beside a laboratory result. Physiological function exists on a continuum. A new study in GeroScience provides an unusually clear example of why this

For decades, nutrition has been framed as a competition between macronutrients. First, fat was blamed for obesity and cardiovascular disease. Then carbohydrate became the problem, particularly through its effects on insulin. More recently, protein has increasingly been promoted as the solution: more satiety, better muscle maintenance, improved body composition and easier weight control. At the same time, another camp warns that too much protein could activate growth pathways