Inflammaging and Aging: The Role of Oxidative Stress and Mitochondria

Biological aging does not coincide with chronological age. Two people who are 70 can have very different risk profiles because they differ in chronic inflammatory burden, metabolic resilience, and functional reserve. In this scenario, oxidative stress, mitochondrial dysfunction, and inflammaging are three facets of the same process: a self-reinforcing loop in which oxidative damage, pro-inflammatory signals, and deteriorating mitochondrial quality feed each other, contributing to frailty and multimorbidity.

In integrative medicine, the useful question isn’t “how do I lower free radicals?”, but “which modifiable levers reduce inflammatory burden and improve energy efficiency without interfering with normal adaptive signaling (mitochondrial hormesis)?”

Inflammaging: What It Is and Why It Matters

The term inflammaging denotes a chronic, low-grade systemic inflammation that increases with age and is associated with greater susceptibility to chronic diseases, disability, and frailty. It is not a silent infection, but the product of multiple drivers: accumulation of senescent cells with a senescence-associated secretory phenotype (SASP), immunosenescence, barrier dysfunction (gut, adipose tissue), metabolic alterations, and reduced physical activity.

Clinically, inflammaging presents as a “background noise”: high-sensitivity C-reactive protein (hs-CRP) persistently in the high-normal range, elevated interleukin-6 (IL-6) or tumor necrosis factor alpha (TNF-α) when measured, anemia or anorexia, loss of muscle mass, and slow recovery after acute stress. It isn’t a single diagnosis, but a biological context that makes the body more vulnerable to events such as infections, falls, sarcopenia, and cardiometabolic decompensation.

Mitochondria: Hubs of Oxidative Stress and Inflammation

Mitochondria are both a source and a target of reactive oxygen species (ROS). In physiological conditions, a portion of mitochondrial ROS acts as an adaptive signal: it activates stress-response pathways, triggers mitochondrial biogenesis, and enhances endogenous antioxidant defenses. The problem arises when balance is lost: chronic energy surplus, inflammation, toxins, intermittent hypoxia, sedentary behavior, and aging reduce the efficiency of the respiratory chain and increase ROS production, causing damage to membrane lipids, proteins, and mitochondrial DNA (mtDNA).

Mitochondrial dysfunction can amplify inflammation also through the release of mtDNA and other damage-associated molecular patterns (DAMPs) that activate the innate immune system. In this way, a vicious circle is created: ROS → mitochondrial damage → pro-inflammatory signals → further damage.

In metabolically active tissues (muscle, liver, heart) this circuit is associated with reduced metabolic flexibility, insulin resistance, and loss of functional capacity.

“Oxidative Stress”: Why It’s a Clinically Richer Concept Than It Appears

The term oxidative stress is sometimes used generically. In reality, it describes an imbalance between the production of reactive species and the capacity of antioxidant systems (enzymatic and non-enzymatic) to buffer them. The clinical challenge is that ROS are transient and difficult to measure directly: for this reason, indirect biomarkers (lipid peroxidation, DNA damage, antioxidant status) are used.

Among the most studied markers in humans are F2-isoprostanes (lipid peroxidation) and 8-hydroxy-2′-deoxyguanosine (8-OHdG) (oxidative DNA damage). Recent reviews discuss using these indicators as research tools and, in some contexts, as possible risk/severity markers of disease; routine utility remains limited by pre-analytical variability and the lack of universally validated clinical cutoffs. The practical message: for most patients, it’s more valuable to measure classic inflammaging markers (hs-CRP, metabolic profile, complete blood count, ferritin) and intervene on the drivers than pursue expensive, poorly standardized oxidative panels.

Useful Biomarkers: What Makes Sense to Measure

In practice, inflammaging is captured with a set of “robust” and interpretable markers:

• hs-CRP as a proxy for low-grade systemic inflammation (monitor the trend over time).
• IL-6 and TNF-α are more “biological” but less readily available and more variable; in the literature, they are among the markers most consistently associated with frailty.
• Albumin (and prealbumin) as indirect indicators of inflammatory/nutritional status, with attention to confounders.
• Cardiometabolic markers (HbA1c, lipid profile, triglycerides, HDL; blood pressure) because metabolic dysfunction and inflammation co-potentiate each other.
• Liver and kidney function (ALT/AST; and eGFR — estimated glomerular filtration rate).
• Functional assessment: grip strength, gait speed, performance tests; these often foretell biological damage.

For advanced oxidative stress markers (F2-isoprostanes, 8-OHdG), it makes sense to consider use mainly in research settings or in select cases (protocol monitoring, sports medicine, motivated patients), bearing in mind that intra-individual variability can exceed the effect of a single intervention.

Evidence-Based Interventions: The Hierarchy That Works

Physical activity. It is the most potent lever with the best risk-benefit ratio. Exercise improves mitochondrial function and activates biogenesis pathways; a review of regulators of mitochondrial adaptation highlights the complexity of signals downstream of physical activity and the role of multiple pathways beyond PGC-1α (peroxisome proliferator-activated receptor-gamma coactivator-1 alpha), often cited as the “master regulator” of mitochondrial biogenesis.
Clinically, a meta-analysis in older adults (with and without comorbidity) shows that training reduces CRP and TNF-α and, in some subgroups, IL-6 as well; the effect varies by modality and duration, but the message is consistent: moving lowers the inflammatory “set point.”

Dietary patterns. Large-scale evidence links plant-forward and Mediterranean patterns to lower levels of oxidative stress and inflammation markers. In practice, the priority is to reduce caloric surplus and ultra-processed foods, increase fiber and polyphenols, and favor mostly unsaturated fats. The goal isn’t to “take antioxidants” but to create a metabolic environment that reduces pathogenic ROS.

Sleep and intermittent hypoxia. Fragmented sleep and obstructive sleep apnea (OSA) are often underappreciated drivers of oxidative stress and inflammation. In the presence of snoring, daytime sleepiness, and resistant hypertension, screening (e.g., STOP-Bang) and referral to a sleep center are anti-inflammaging interventions more effective than many supplements.

Stress management and allostatic load. Chronic stress raises cytokines and worsens sleep quality, which in turn increases inflammation: the circuit is bidirectional. Interventions such as CBT-I (cognitive behavioral therapy for insomnia), mindfulness, or breathing training are low-risk and can improve clinical outcomes (sleep, adherence, physical activity), indirectly affecting the inflammatory profile.

Antioxidants: Why “More” Isn’t Always “Better”

The narrative “antioxidants = anti-aging” is seductive but incomplete. A Cochrane review concludes that there is no evidence to support antioxidant supplements for primary or secondary prevention and that beta-carotene and vitamin E appear to increase mortality. Analyses of vitamin A/E and beta-carotene at doses in randomized trials have also raised signals of potential harm, especially in specific contexts and at high doses.

That doesn’t mean “never supplements,” but rather appropriateness: correcting documented deficiencies (e.g., vitamin D, B12, iron) and using nutraceuticals with a specific clinical indication (e.g., omega-3 fatty acids, polyunsaturated n-3 fatty acids; CoQ10 in certain musculoskeletal symptoms associated with statins, SAMS — statin-associated muscle symptoms, selected cases) is different from prescribing “antioxidants” indiscriminately. The concept of mitohormesis helps explain to patients why turning down all oxidative signaling could theoretically blunt beneficial adaptations, such as to exercise.

Practical Biomarkers (And How to Interpret Them)

First level (routine, high utility):

• hs-CRP (trend over time > a single value)
• Complete blood count, ferritin, B12/folates, TSH (fatigue, frailty, cognitive symptoms)
• HbA1c, lipid profile, ALT/AST, creatinine/eGFR
• Albumin (with nutritional and hydration context)

Second level (if available/useful):

• IL-6 and/or TNF-α (frailty is multifactorial; biological variability)

Advanced oxidative markers (selected):

• F2-isoprostanes, 8-OHdG: useful mainly for research/monitoring, not for routine diagnosis

Practical rule: always interpret alongside clinical context and functional status (grip strength, gait, body composition). A robust patient with mildly elevated hs-CRP is managed differently from a frail patient with muscle loss and slow recovery.

A Stepwise Protocol for Integrated Medicine

Step 1 – Identify the drivers. Beyond the classic (visceral fat, sedentary behavior, diet), look for: OSA, chronic pain, depression, medications with metabolic/inflammatory impact, alcohol, smoking, chronic infections, oral health.

Step 2 – Core therapy (8–12 weeks).

• Mediterranean/plant-forward diet, moderate caloric deficit if indicated.
• Combined exercise: 2–3 resistance sessions per week + 150 minutes per week of aerobic activity (tailor to frailty).
• Sleep: circadian regularity; screen for OSA if suspected.
• Stress: brief behavioral intervention + realistic goals.

Step 3 – Targeted adjunct (only if necessary).

• Omega-3s if triglycerides elevated or appropriate metabolic profile.
• Protein support (and leucine) in sarcopenia/frailty, with resistance training.
• CoQ10 only in specific indications (SAMS), not as a generic anti-aging measure.
• Avoid “megadoses” of antioxidants; prefer nutrients from food.

Step 4 – Reassess with measurable outcomes. hs-CRP, weight/life measures, HbA1c/lipids, blood pressure, grip strength and functional tests, sleep quality. If no improvement, reconsider diagnosis (inflammatory, neoplastic, autoimmune) or adherence/intensity of interventions.

Oxidative stress, mitochondrial dysfunction, and inflammaging are real biological concepts, but they become clinically useful only when translated into drivers and outcomes. The intervention hierarchy is clear: physical exercise and Mediterranean/plant-forward dietary patterns have the strongest evidence for reducing inflammatory markers and improving metabolic resilience. Generic antioxidant supplements have not demonstrated preventive benefits and can be harmful at high doses; the appropriate approach is to correct deficiencies and use targeted adjuncts when there is a clinical objective. In integrated medicine, “healthy longevity” isn’t built by turning off ROS, but by reducing the drivers of chronic inflammation and restoring adaptive capacity.

Minimum 12-Week Outcomes (to Decide Whether to Continue or Change)

• hs-CRP: meaningful reduction or downward trend (interpret in the context of intercurrent events).
• Metabolic: HbA1c, triglycerides, HDL, blood pressure (even small changes count).
• Functional: improved TUG (Timed Up and Go) and/or SPPB (Short Physical Performance Battery); increased grip strength.
• Aerobic capacity: improved tolerance to exertion / VO₂ (estimated oxygen uptake).
• Body composition: reduced waist circumference and maintenance/increase of lean mass.
• Sleep: improved ISI (Insomnia Severity Index) / PSQI (Pittsburgh Sleep Quality Index); reduced daytime sleepiness; if OSA is suspected, initiate diagnostic pathway.

Article adapted from the September 2026 issue of Integrative Medicine

References

1. Ferrucci L, Fabbri E. inflammaging: chronic inflammation in ageing, cardiovascular disease, and frailty. Nat Rev Cardiol. 2018;15(9):505-522.
2. Karpuzoglu E, Holladay SD, Gogal RM Jr. inflammaging: triggers, molecular mechanisms, immunological consequences, sex differences, and cutaneous manifestations. Front Immunol. 2025;16:1704203.
3. Xu X, Pang Y, Fan X. Mitochondria in oxidative stress, inflammation and aging: from mechanisms to therapeutic advances. Signal Transduct Target Ther. 2025;10(1):190.
4. Pan Y, Ma L. Inflammatory markers and physical frailty: towards clinical application. Immunity & Ageing. 2024;21:4.
5. Alberro A, Iribarren-Lopez A, Sáenz-Cuesta M, Matheu A, Vergara I, Otaegui D. Inflammaging markers characteristic of advanced age show similar levels with frailty and dependency. Sci Rep. 2021;11(1):4358.
6. Islam H, Hood DA, Gurd BJ. Looking beyond PGC-1α: emerging regulators of exercise-induced skeletal muscle mitochondrial biogenesis and their activation by dietary compounds. Applied Physiology, Nutrition, and Metabolism. 2020;45(1):11–23. doi:10.1139/apnm-2019-0069.
7. Khalafi M, Akbari A, Symonds ME, Pourvaghar MJ, Rosenkranz SK, Tabari E. Influence of different modes of exercise training on inflammatory markers in older adults with and without chronic diseases: A systematic review and meta-analysis. Cytokine. 2023;169:156303.
8. Aleksandrova K, Koelman L, Rodrigues CE. Dietary patterns and biomarkers of oxidative stress and inflammation: A systematic review of observational and intervention studies. Redox Biology. 2021;42:101869.
9. Bjelakovic G, Nikolova D, Gluud C. Meta-Regression Analyses, Meta-Analyses, and Trial Sequential Analyses… Do We Have Evidence for Lack of Harm? PLoS One. 2013;8(9):e74558.
10. Cochrane Review. Antioxidant supplements for prevention of mortality. 2021.
11. Ilari S, Proietti S, Milani F, et al. Dietary Patterns, Oxidative Stress, and Early Inflammation: A Systematic Review and Meta-Analysis Comparing Mediterranean, Vegan, and Vegetarian Diets. Nutrients. 2025;17(3):548.