Personalized Approach to Health: Why It Matters

Health is not determined by a single factor, nor is it influenced in the same way in every person. Modern medicine increasingly recognizes that similar clinical presentations may arise from different biological mechanisms, different predispositions, and different needs for prevention or monitoring. This is the basis of a personalized approach to health: understanding an individual not only through general principles and population averages, but also by accounting for the specific characteristics that shape their biological profile.

In practice, this means health assessment is not based on a single characteristic or finding, but on integrating different types of information. Medical history, clinical presentation, and, laboratory data are considered together to provide a targeted and meaningful assessment of each individual’s health.

Personalization, however, does not replace the general principles of prevention and healthcare. Avoiding smoking, following a balanced diet, engaging in regular physical activity, getting adequate sleep, and maintaining a healthy body weight remain important recommendations. A personalized approach adds another level: it considers which factors are most relevant to a specific individual and which information can support more targeted, evidence-based health decisions.

Why Do We Differ So Much From One Another?

People’s different responses to the same environmental or dietary conditions cannot be attributed to a single mechanism. Instead, they result from variation across multiple biological levels.

1. Genetic Background

The human genome is largely shared among individuals, but it contains millions of genetic variants. Some have minimal or unknown effects, while others can influence characteristics such as the metabolism of specific nutrients, blood lipid levels, responses to medications, or susceptibility to certain diseases.

The contribution of genetic variants to disease development varies by condition. In certain inherited disorders, such as cystic fibrosis, pathogenic variants in a specific gene are the primary cause. In contrast, common multifactorial diseases, such as type 2 diabetes and cardiovascular diseases, are generally not determined by a single gene. Multiple genetic variants may contribute to varying degrees, while environmental and behavioral factors also influence whether the disease ultimately develops. Therefore, in multifactorial diseases, genetic predisposition should not be confused with the certainty that an individual will develop a particular disease.

2. Epigenetics and Regulation of Gene Function

Beyond the DNA sequence itself, the way gene function is regulated is also important. Genes are not continuously active to the same degree. Different biological mechanisms can regulate their activity, affecting when and to what extent they are expressed.

Epigenetics is one level of regulation and examines mechanisms that influence gene activity without altering the DNA sequence itself. These include, among others, DNA methylation and histone modifications. Age, diet, and various environmental exposures have been associated with epigenetic changes.

This field is of considerable research interest, but caution is required when interpreting its clinical significance. Association with an epigenetic change does not, by itself, prove that a factor causes a specific disease or that modifying a particular marker will necessarily improve health.

3. Environment and Lifestyle

Another important factor is the range of exposures that accumulate throughout life. In modern research, the term “exposome” describes the totality of environmental exposures an individual experiences over the course of their life and their effects on the body. These may include air pollution, chemicals, medications, exposures at work, and lifestyle factors.

Diet, physical activity, sleep, smoking, and alcohol consumption are common lifestyle factors that can, over time, influence metabolic and cardiovascular health, inflammatory status, and other biological functions. However, their effects do not occur independently of each individual’s broader biological and environmental context.

The study of the exposome seeks to complement genetic information by investigating how environmental exposures and lifestyle habits interact with the body’s biological mechanisms over time. This is a developing scientific field, and integrating these data into everyday clinical practice remains under investigation.

From Individual Differences to Personalized Assessment

Recognizing biological differences between individuals is only the first step. A personalized approach acquires practical significance when these differences are considered alongside each person’s specific characteristics, history, and needs.

In practice, an assessment may consider age and sex, personal and family history, risk factors, diet, physical activity, sleep, medication use, symptoms, and available clinical and laboratory data. In specific cases, additional information from genetic or other specialized biomarkers may also be valuable.

The key, therefore, does not lie in isolating a single characteristic, but in integrating different types of information. The same laboratory finding or risk factor may have different significance depending on the broader context.

This is also the fundamental aim of a personalized approach: not to treat every person as an entirely unique biological case, but to adapt prevention, assessment, and monitoring to the individual's characteristics, where scientifically supported.

Laboratory Data and Personalized Assessment

Laboratory tests typically compare a result with a reference range. Reference ranges are a fundamental tool in laboratory medicine; however, they do not turn a result into a stand-alone answer about an individual’s health status.

A single value rarely describes the overall biological picture. The significance of a biomarker depends on the specific question being investigated, and in some cases, changes in a marker over time may provide useful information beyond a single measurement.

A personalized approach, therefore, does not mean performing more tests, but rather selecting appropriate laboratory data based on the specific question being addressed. Depending on the individual case, different aspects of a person’s biology may be assessed, such as metabolic status, micronutrient levels, fatty acid profiles, the gut microbiome, or genetic predisposition.

At Diagnostiki Athinon, groups of tests such as NutriScan®, EnteroScan®, and myGenomiX® can, when appropriately indicated, provide additional information in some of these areas.

Importantly, no single laboratory result constitutes a “personalized answer” on its own. The value of the data comes from selecting and interpreting it within each individual's broader clinical and biological context.

Conclusion: The Value of Personalization Lies in the Right Information

A personalized approach to health is based on recognizing that each individual has a unique biological profile, shaped by their genetic makeup, metabolism, diet, gut microbiome, environment, lifestyle, and personal and family medical history.

Modern laboratory technology makes it possible to investigate many of these factors. However, the essence of personalization does not lie in collecting as much data as possible, but in identifying the information that is truly relevant to each individual. Depending on their needs and medical history, the assessment may focus on metabolic risk, genetic predisposition, nutritional status, or other biological factors.

The goal is not to replace clinical evaluation or established principles of prevention, but to meaningfully complement them with targeted, scientifically supported information. Ultimately, the true value of personalization is not about knowing more about everyone, but about knowing what matters most for each individual.

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At Diagnostiki Athinon, we treat prevention with the seriousness it deserves. This is where science meets personalized care.