Epigenetics: the influence of the environment on health regulation, the view from Psychoneuroimmunology

Scientific research has shown that genetic information does not act in isolation, nor does it determine health trajectories throughout life in a linear fashion. Epigenetics, a field that studies the biochemical mechanisms that regulate gene expression without altering the DNA sequence, contributes to a more dynamic understanding of human biology by highlighting the continuous interaction between genetic, environmental and behavioural factors.

In this context, genetic predisposition can be understood as a set of biological possibilities whose expression is modulated by multiple variables over time. Food, stress, sleep, environmental exposure and physical activity influence cellular processes that regulate which genes tend to be more or less expressed in certain physiological contexts.

A metaphor often used to clarify this concept describes genes as light bulbs in a space, while the organism's internal and external environment acts as a system of switches that condition their activation or inhibition. This perspective does not eliminate the role of genetics, but broadens the understanding of the factors that contribute to individual variability in health.

The role of epigenetics in metabolic health

For decades, conditions such as obesity, type 2 diabetes, changes in lipid profile and cardiovascular disease have been interpreted predominantly as direct consequences of genetic inheritance or ageing. Research into epigenetics has shown that these conditions result from complex interactions between genetic predisposition and environmental factors, with an impact on metabolic, inflammatory and hormonal regulation.

Epigenetic mechanisms, such as DNA methylation or histone modifications, influence the expression of genes involved in energy metabolism, the immune response and low-grade inflammation. These changes largely reflect the body's cumulative exposure to certain stimuli over time, without implying determinism or irreversibility.

Factors associated with modulating gene expression

• Food: Dietary patterns based on low-processed, nutrient-dense foods are associated with a more stable metabolic environment. Certain nutrients and bioactive compounds, such as polyphenols or omega-3 fatty acids, have been studied for their potential role in modulating epigenetic pathways related to inflammation and the stress oxidation.
• Emotional health and stress: Prolonged exposure to stress can influence gene expression through neuroendocrine mechanisms, affecting metabolic and immune regulation. Emotional regulation and stress reduction strategies stress have been associated with measurable changes in biological markers, although their effects depend on the individual context.
• Exposure to environmental factorsPollutants, pesticides, heavy metals and certain chemical substances can interfere with epigenetic processes, contributing to inflammatory and metabolic imbalances. The accumulated environmental load is a relevant element in clinical assessment, especially in contexts of chronic exposure.
• Sleep and circadian rhythm: The quality and regularity of sleep influence the expression of genes involved in metabolic homeostasis, immune function and cell repair mechanisms. Dysregulation of the circadian rhythm has been associated with an increased risk of metabolic alterations, without there being a simple or unique causal relationship.
• Physical exercise: Regular physical activity is associated with epigenetic changes related to improved insulin sensitivity, mitochondrial function and inflammatory regulation. These effects vary depending on the intensity, frequency and suitability of the exercise to individual characteristics.

Understanding epigenetics from an integrative perspective

Epigenetics offers a conceptual framework that reinforces the importance of prevention and contextualised clinical assessment, without reducing health to an exclusively genetic or behavioural logic. Metabolic alterations can be interpreted as adaptive responses of the organism to certain internal and external contexts, opening up space for clinical approaches that integrate multiple dimensions of human physiology.

Clinical Psychoneuroimmunology frames this knowledge by studying the interaction between the nervous, endocrine and immune systems, allowing for a more comprehensive assessment of the factors that influence gene expression. Within the scope of Integrative Osteopathy, this approach translates into a clinical assessment that takes into account diet, sleep and circadian rhythm, physical activity and emotional health, always in line with the available scientific evidence.

Understanding epigenetics in this way contributes to a vision of health as a dynamic and adaptive process, sustained by the continuous interaction between biology, environment and lifestyle, without resorting to oversimplifications or absolute statements.