Protein restriction, rapamycin, and the missing biology of rhythm A provocative new review, The hallmarks of protein and amino acid restriction in aging and longevity, argues that eating less protein—or restricting particular amino acids—may improve metabolic health, reduce cellular senescence, and extend healthy lifespan. The review brings together an impressive body of evidence. It highlights methionine, isoleucine, and valine as especially influential amino acids and propo

Grey hair is usually treated as a one-way sign of aging: pigment is lost, the follicle has become “old,” and the change is permanent. A study led by Ayelet Rosenberg and Martin Picard challenges that simple picture. By analysing pigmentation patterns along individual human hairs, the researchers documented something unusual but biologically important: some hairs that had turned grey later regained their original colour. The study does not show that stress reduction will relia

The lining of the respiratory tract is often described as a barrier. That description is incomplete. The airway epithelium is a living, metabolically active tissue that detects microbes, communicates with immune cells, produces mucus and antimicrobial molecules, regulates inflammation, and repairs itself after injury. It also appears capable of remembering what it has encountered. A recent review in Cell Reports, “Microbial imprinting of the airway epithelium,” proposes that

When we think about the immune system, we usually picture its defensive side: detecting danger, attacking pathogens, and generating inflammation. But an effective immune response is not complete when the threat is contained. The body must also stop the response, clear the damage, rebuild tissue, and restore tolerance. That final stage is recovery—and recovery requires work. A major 2026 review by Jeffrey Bluestone and colleagues places regulatory T cells, or Tregs, at the cen

Cellular senescence is often described as the end result of accumulated damage. DNA breaks, oxidative stress, telomere shortening, inflammation, and oncogenic signals eventually persuade a cell to stop dividing. That explanation is important, but incomplete. A growing body of research suggests that metabolism is not merely damaged after a cell becomes senescent. The cell’s capacity to transform nutrients into usable energy, maintain redox balance, and support biosynthesis may

Anabolism is the biology of building. Cells build proteins, membranes, nucleotides, organelles and extracellular matrix. Tissues rebuild muscle after exercise, replace damaged cells, expand immune populations during infection and regenerate after injury. These processes require nutrients, hormonal signals and growth pathways—but they also require something more fundamental: sufficient metabolic throughput to convert those signals and raw materials into functional new structur

Senescent cells have become one of the most recognizable targets in longevity science. These are damaged or stressed cells that enter a persistent state in which they no longer function normally and may release inflammatory and tissue-remodeling signals collectively known as the senescence-associated secretory phenotype, or SASP. Because senescent cells accumulate with age and can contribute to chronic inflammation, fibrosis and impaired tissue repair, a seemingly straightfor

Cells are constantly exposed to stress. Nutrient shortages, infection, inflammation, toxins, hypoxia, DNA damage, excessive substrate supply, and mechanical strain all increase the demand placed on cellular systems. Yet the same stress does not produce the same outcome in every cell. One cell repairs the damage and returns to normal. Another adapts but remains altered. A third stops dividing and becomes senescent. Others undergo apoptosis, necroptosis, pyroptosis, ferroptosis

Sit-to-Stand Testing, Functional Reserve, and Early ERM Most people think of health testing as something that happens through blood work, scans, or advanced laboratory panels. These tools are important, but sometimes the body gives us meaningful information through very simple functional signs. One of the simplest examples is this: how easily can a person stand up from a chair? A recent editorial in the British Journal of Sports Medicine highlights the sit-to-stand test as a

A recent narrative review in The American Journal of Clinical Nutrition asked an important question: can biomarkers help individualize nutritional therapy in disease-related malnutrition? The authors reviewed markers such as CRP, IL-6, creatinine, albumin, prealbumin, red cell distribution width, handgrip strength, CT-based muscle assessment, endocrine markers, catabolic markers, metabolomics, and AI-supported prediction models. Their proposal is timely: nutritional therapy s

How mitochondrial congestion, redox balance, and metabolic rerouting shape immune activation When most people hear the word inflammation, they imagine something bad: swelling, pain, autoimmunity, allergies, or chronic disease. But inflammation is not the enemy. Inflammation is one of the body’s most important survival programs. The real question is not simply, “Is the immune system activated?” A better question is: Why does the immune system feel the need to stay activated? A

Why Aging May Begin Upstream in Bioenergetic Constraint Cellular senescence is often described as one of the major biological processes of aging. In simple terms, senescence occurs when a cell stops dividing but remains metabolically active. It does not die immediately. Instead, it changes its behavior, alters its metabolism, and begins sending out signals to surrounding cells and the immune system. For many years, senescence has been viewed mainly as a damage response. Cells

The Hidden Link Between Energy Stress, Immunity, and Brain Aging Mitochondria are often introduced as the “powerhouses of the cell.” That description is useful, but incomplete. Mitochondria do not only produce energy. They also sense stress, coordinate adaptation, regulate cell survival, and communicate with the immune system. When mitochondrial stress is temporary, this communication can be protective. It helps the body respond to infection, injury, toxic exposure, nutrient

Insulin resistance is often described as a blood sugar problem. In the usual explanation, the body becomes less responsive to insulin, glucose becomes harder to control, and the risk of type 2 diabetes increases. This explanation is important, but it may not be complete. A recent review by Boccardi and Sinclair, titled Rethinking insulin resistance in aging: A reserve-oriented clinical framework, offers a broader view. The authors suggest that, especially in aging, insulin re

At the AGE 2026 Annual Meeting, I had the opportunity to present our poster titled “Mitochondrial Throughput Limitation as a Bioenergetic Bottleneck in Aging.” The central question behind this work is simple: Do many aging-related metabolic problems arise, at least partly, from a shared limitation in the body’s ability to process, convert, and recover from biological stress? We often describe aging through its visible outcomes: increased fat accumulation, reduced muscle respo

Tinnitus is often described simply as “ringing in the ears.” But a recent Nature Reviews Disease Primers article makes clear that tinnitus is much more than an ear problem. It is a complex brain–ear condition involving hearing pathways, stress systems, emotional salience, attention, sleep, and large-scale brain networks. For some people, tinnitus is mild and temporary. For others, it becomes chronic, intrusive, and exhausting. The difference may not depend only on the loudnes

Sleep, Recovery, and the Body’s Energy Budget For many years, sleep has been treated as a simple health behavior: sleep more, feel better, live longer. In many cases, this is true. Too little sleep clearly harms the brain, metabolism, immune system, cardiovascular system, mood, and long-term health. But emerging research is adding an important nuance: more sleep is not always better. Two recent papers help explain why. One, the One Sleep Health framework by Tahmasian and coll

We often talk about mitochondria as the “powerhouses” of the cell. That metaphor is useful, but incomplete. Mitochondria do not simply make energy. They help decide whether a cell can repair, recycle, adapt, or eventually fall into chronic dysfunction. A recent review by Marzetti and colleagues, “Mitochondrial quality in aging and neurodegeneration: The emerging role of mitochondria-derived vesicles,” adds an important layer to this story. The authors describe how mitochondri

For several years, NAD⁺ has been one of the most popular molecules in the longevity world. It appears in supplement marketing, biological aging discussions, mitochondrial health programs, and even consumer testing panels. The story is often presented in a simple way: NAD⁺ declines with age, lower NAD⁺ means poorer cellular energy, and raising NAD⁺ may help restore youthful function. There is some biological logic behind this. NAD⁺ is deeply involved in metabolism, mitochondri

We often talk about mitochondria as the “power plants” of the cell. That metaphor is useful, but incomplete. Mitochondria do not only make ATP. They also help organize cellular metabolism, redox balance, stress signaling, inflammation, and repair. A new study in Cell Reports adds another important layer: mitochondria may help lysosomes stay acidic enough to digest and recycle cellular waste. This matters because one of the major biological features of aging is impaired macroa