Scientific verification document: which elements of the Approach are supported by the most recent literature and with what degree of evidence
This article is part of a three-part series:
1. Integrated approach to reducing low-grade chronic inflammation — the operational document: which behaviors and strategies to adopt.
2. Integrated approach to reducing low-grade chronic inflammation in light of 2026 scientific research — the scientific verification document: which elements of the Approach are supported by the most recent literature and with what degree of evidence.
3. Low-grade chronic inflammation: the topic in science communication in the international press in 2026 — the communication analysis document: how the topic is presented, interpreted, and communicated by the international scientific and general press.
Introduction
The Integrated Approach to reducing low-grade chronic inflammation considers this phenomenon not as the result of a single factor, but as the expression of the interaction among nutrition, metabolism, body composition, physical activity, muscle function, gut microbiota, sleep, circadian rhythms, stress, and the biological processes of aging.
Scientific research published in 2026 provides several points of support for this framework. In particular, recent literature on inflammaging describes low-grade chronic inflammation as a systemic and multifactorial process in which cellular senescence, mitochondrial dysfunction, metabolic alterations, changes in immune function, microbiota, nutrition, physical activity, and environmental and behavioral factors converge [1].
Not all elements of the Integrated Approach have the same level of evidence, and it would not be correct to interpret the convergence among different studies as experimental proof of the entire model. What is relevant is that numerous components of the Approach are supported, separately and sometimes jointly, by the most recent scientific literature. This chapter therefore distinguishes among direct support, mechanistic support, and general consistency with the evidence.
1. Low-grade chronic inflammation as a systemic phenomenon
Support for the Integrated Approach
One of the fundamental premises of the Integrated Approach is that low-grade chronic inflammation should not be interpreted exclusively as a local phenomenon or as the consequence of a single disease. Instead, it may represent a systemic biological state arising from the interaction of multiple mechanisms.
2026 Research
Andrea Cossarizza’s review, “Inflammaging: Experimental Insights and Translational Advances,” published in the European Journal of Immunology, defines inflammaging as persistent, sterile, low-grade inflammation associated with aging and analyzes a network of mechanisms including cellular senescence, the senescence-associated secretory phenotype (SASP), mitochondrial dysfunction, immune-cell senescence, hyperactivation of innate immunity, defective resolution of inflammation, and dysregulation of nutrient-sensing systems [1].
Assessment of the evidence
The support is strong. The work directly supports the systemic and multifactorial conception adopted in the Integrated Approach: low-grade chronic inflammation emerges as the result of interconnected biological networks rather than as the linear consequence of a single causal element.
2. Nutrition as a modulator of inflammation
Support for the Integrated Approach
The Integrated Approach assigns nutrition an important but not exclusive role. Diet is considered one of the main modifiable factors capable of influencing chronic inflammation through different metabolic, oxidative, immune, and microbiota-related pathways.
2026 Research
The review “Dietary Bioactive Compounds and Inflammaging: Pro- and Anti-Inflammatory Effects” analyzes both dietary components capable of promoting the activation of inflammatory pathways — including advanced glycation end products, lipid peroxidation products, oxysterols, and trans fats — and bioactive compounds with potentially modulatory effects, including polyphenols, omega-3 fatty acids, carotenoids, vitamins, and certain micronutrients. The authors describe multiple molecular pathways involved, including NF-κB, Nrf2, sirtuins, and inflammation-resolution systems [2].
Assessment of the evidence
The support is strong at the biological level and consistent with an essential point of the Approach: not attributing to a single food the ability to “switch off” inflammation, but interpreting nutrition as a modulator of a complex biological network. The effect must be assessed within the context of the overall dietary pattern and the individual’s other physiological and behavioral conditions.
3. Physical activity and control of inflammatory pathways
Support for the Integrated Approach
In the Integrated Approach, physical activity is not considered simply a tool for increasing energy expenditure. Exercise modifies the functioning of numerous metabolic and immune systems and may contribute to regulation of the inflammatory state.
2026 Research
The review “Exercise-Mediated Modulation of the NLRP3 Inflammasome” analyzes one of the mechanisms through which exercise may influence inflammation: modulation of the NLRP3 inflammasome. The authors report that physical activity can reduce NLRP3 activation through different interconnected biological pathways, within a framework in which mitochondrial dysfunction, oxidative stress, and metabolic alterations contribute to inflammaging [3].
Assessment of the evidence
The support is primarily mechanistic but important. It strengthens the decision to consider movement as an autonomous component of the Approach, closely connected with metabolism, body composition, and muscle function.
4. Skeletal muscle, myokines, and systemic communication
Support for the Integrated Approach
The Approach considers skeletal muscle a metabolically active organ and not merely a structure responsible for movement. During and after exercise, muscle produces signaling molecules capable of interacting with other organs and systems.
2026 Research
The review “The Myokine Adaptome in Health and Disease: Exercise-Induced Cellular Signaling, Muscle–Organ Crosstalk, and Therapeutic Plasticity” proposes the concept of the myokine adaptome, namely a context-dependent signaling network through which skeletal muscle translates contractile, metabolic, mechanical, and inflammatory stimuli into systemic effects. Myokines and exerkines participate in communication with other organs and influence glucose and lipid metabolism, immune regulation, vascular function, neuroplasticity, and tissue regeneration [4].
Assessment of the evidence
The support is strong for the general concept of muscle as an endocrine and metabolic organ. Prudence is nevertheless required regarding the clinical effects attributed to individual myokines, because part of the evidence remains experimental or context-dependent.
5. Metabolism and inflammation
Support for the Integrated Approach
Another central element of the Approach is the bidirectional relationship between metabolic alterations and inflammatory status. Insulin resistance, visceral adiposity, alterations in glucose and lipid metabolism, and mitochondrial dysfunction do not necessarily represent phenomena independent of inflammation, but may interact with it.
2026 Research
Cossarizza’s review includes mitochondrial dysfunction and dysregulation of cellular nutrient-sensing and nutrient-utilization systems among the mechanisms of inflammaging [1]. A further 2026 paper, “Inflammaging: Immune–Metabolic Crosstalk Between the Prostate–Testis and Musculoskeletal System,” describes circuits in which inflammation, oxidative stress, metabolism, mitochondrial function, and the endocrine system can mutually reinforce one another [5].
Assessment of the evidence
The support is strong at the level of pathophysiological integration. It supports the decision not to observe a single metabolic parameter in isolation, but to assess metabolic and inflammatory indicators together and, above all, their evolution over time.
6. Gut microbiota, barrier, and immunity
Support for the Integrated Approach
The Integrated Approach considers the intestine and microbiota as one of the components of systemic immune regulation, while avoiding attribution to the microbiota of an exclusive role in the origin of chronic inflammation.
2026 Research
The review “From Primates to People: Mapping Host-Microbiome-Health Relationships in Aging,” published in Ageing Research Reviews, links age-associated dysbiosis with inflammaging and systemic decline. The microbiome is described as an important modulator of physiology, metabolism, and immune function; however, the authors emphasize that causality and mechanisms are not yet fully clarified and highlight the limitations of human studies and experimental models [6].
Assessment of the evidence
The support is strong for inclusion of the microbiota within the network, but does not justify a monocausal explanation. Diet, age, physical activity, medications, environment, and individual characteristics can modify the microbiota; in parallel, the microbiota can influence metabolism, the intestinal barrier, and the immune response. The relationship is therefore dynamic and bidirectional.
7. Sleep, circadian rhythms, and immunometabolic regulation
Support for the Integrated Approach
In the Integrated Approach, sleep is not considered merely a period of rest, but a component of metabolic, endocrine, circadian, and immune regulation.
2026 Research
The review “Sleep Deterioration as a Systems-Level Readout of Aging Biology: Integrating Metabolic, Inflammatory and Circadian Mechanisms,” published in Ageing Research Reviews, interprets deterioration of sleep during aging as an expression of the progressive alteration of interconnected metabolic, inflammatory, and circadian systems [7].
The review “Circadian–Immune Crosstalk in Insomnia Disorder: Mechanisms and Therapeutic Implications” specifically analyzes the interaction among circadian rhythms, melatonin, endocrine function, and immune-inflammatory activity, highlighting the role of low-grade inflammation in chronic insomnia [8].
Assessment of the evidence
The support is strong for inclusion of sleep and chronobiology in the model. The bidirectional nature of the relationship must nevertheless be maintained: persistent alterations in sleep and circadian rhythms may be accompanied by metabolic and immune changes, while diseases, stress, metabolic dysfunction, and inflammation may in turn impair sleep.
8. Chronic stress and neuroendocrine regulation
Support for the Integrated Approach
The Integrated Approach includes chronic stress among the factors potentially capable of maintaining neuroendocrine and metabolic conditions favorable to inflammation. The central point is not the single episode of stress, which constitutes a normal adaptive response, but the persistent alteration of physiological regulation and recovery systems.
Relationship with 2026 evidence
The 2026 reviews on sleep, circadian rhythms, and inflammaging show the close communication among neuroendocrine, metabolic, and immune systems [1,7,8]. However, among the works selected for this chapter there is no single 2026 study sufficiently general to demonstrate that every form of chronic stress directly causes low-grade chronic inflammation.
Assessment of the evidence
The support is therefore primarily systemic and mechanistic. The inclusion of stress in the Approach is consistent with contemporary physiology, but must avoid the simplistic equation “stress = inflammation.”
9. Inflammaging and biological aging
Support for the Integrated Approach
The Approach assigns particular importance to biological age and considers low-grade chronic inflammation one of the processes that may contribute to the progressive loss of efficiency of physiological systems.
2026 Research
Cossarizza’s review represents the most important general reference among those examined because it places persistent low-grade inflammation within the biological processes of aging and age-related diseases [1]. The work by Bossio and colleagues also interprets inflammaging through a network of immunometabolic, endocrine, and muscular interactions [5].
Assessment of the evidence
The support is strong. Chronological age cannot be modified; numerous factors that interact with the aging process can, at least in part, be modified. The realistic objective of the Approach is therefore not to “eliminate” inflammaging, but to act on modifiable factors that may contribute to its intensity and evolution.
10. Convergence of factors: why an integrated approach
The perhaps most significant aspect of the 2026 scientific research examined is not the support for a single element of the Approach, but the growing representation of chronic inflammation and aging as multidimensional phenomena [1–8].
Nutrition, physical activity, muscle, metabolism, microbiota, sleep, circadian rhythms, stress, and aging do not act as completely independent variables. Physical activity modifies metabolism and inflammatory signaling; muscle participates in endocrine communication through myokines; diet interacts with metabolism and microbiota; the microbiota communicates with the immune system; sleep and circadian rhythms are linked to metabolic, endocrine, and immune regulation; aging acts transversally across all these systems.
The 2026 literature does not demonstrate the existence of a single protocol capable of globally controlling low-grade chronic inflammation. It does, however, provide important conceptual support for a strategy that simultaneously observes multiple modifiable factors and follows their evolution over time.
From this perspective, the Integrated Approach to reducing low-grade chronic inflammation appears consistent with the tendency of recent research to interpret inflammaging and the regulation of inflammation through interconnected biological networks, rather than through a single causal factor or a single intervention.
Conclusion
Comparison with the 2026 scientific literature shows that the general framework of the Integrated Approach finds significant support in contemporary research. The strongest support concerns the systemic and multifactorial nature of inflammaging, the interaction between metabolism and inflammation, the role of physical activity and muscle, the participation of the microbiota, and the integration among sleep, circadian rhythms, and immunometabolic function [1–8].
The convergence of evidence does not, however, amount to clinical validation of a specific therapeutic protocol. Many of the cited works are reviews and integrate results from different studies; some mechanisms are better demonstrated than others, and individual responses to interventions remain variable.
The value of the Integrated Approach therefore currently lies above all in its consistency with an increasingly systemic view of the biology of aging: acting on modifiable factors, avoiding monocausal explanations, and monitoring over time the evolution of clinical, metabolic, and inflammatory parameters.
Bibliographic references
[1] Cossarizza A. Inflammaging: Experimental Insights and Translational Advances. European Journal of Immunology. 2026;56(7):e70239. DOI: 10.1002/eji.70239.
[2] Moskalev A, et al. Dietary Bioactive Compounds and Inflammaging: Pro- and Anti-Inflammatory Effects. 2026. PubMed PMID: 42425421.
[3] Zhang Y, et al. Exercise-Mediated Modulation of the NLRP3 Inflammasome. 2026. PubMed PMID: 42557399.
[4] Mănescu DC, Plastoi CD, Pîrvan A, Dîrnu R, Floroiu EA, Popescu A. The Myokine Adaptome in Health and Disease: Exercise-Induced Cellular Signaling, Muscle–Organ Crosstalk, and Therapeutic Plasticity. Cells. 2026;15(14):1236. DOI: 10.3390/cells15141236.
[5] Bossio S, Russa D, Rago V, Di Dio M, Aversa A, Perri A. Inflammaging: Immune–Metabolic Crosstalk Between the Prostate–Testis and Musculoskeletal System. International Journal of Molecular Sciences. 2026;27(8):3612. DOI: 10.3390/ijms27083612.
[6] Olmo-Fontánez A, Reveles KR, Sharan R, Cheeseman I, Phillips KA, Wolford KL, Ross CN. From Primates to People: Mapping Host-Microbiome-Health Relationships in Aging. Ageing Research Reviews. 2026;121:103278. DOI: 10.1016/j.arr.2026.103278.
[7] Murillo-Cancho AF, Lozano-Paniagua D, Martín-Latorre MDM, Ramírez-Santos J, Nievas-Soriano BJ. Sleep Deterioration as a Systems-Level Readout of Aging Biology: Integrating Metabolic, Inflammatory and Circadian Mechanisms. Ageing Research Reviews. 2026;118:103084. DOI: 10.1016/j.arr.2026.103084.
[8] Huang Y, Wang X, Chen X, Liu Y. Circadian–Immune Crosstalk in Insomnia Disorder: Mechanisms and Therapeutic Implications. Frontiers in Neuroscience. 2026;20:1881195. DOI: 10.3389/fnins.2026.1881195.
Methodological note
The works cited do not all have the same nature or the same evidentiary value. Several are reviews and therefore synthesize knowledge produced by previous studies rather than constituting new clinical experiments. Their value for the purposes of this article lies primarily in showing how different strands of contemporary scientific research converge on the existence of interactions among inflammation, metabolism, muscle function, microbiota, biological rhythms, and aging. This convergence represents scientific support for the general framework of the Integrated Approach, but should not be interpreted as clinical validation of a specific therapeutic protocol.
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