Global health. How to address the health challenges in an increasingly uncertain world?

The uncertainty that characterizes our time is not manifested solely in natural disasters, technological transformations, or environmental crises. It is also present in our health. The emergence of new diseases, resistance to treatments, pandemics, and persistent health inequalities remind us that human health depends on complex biological, environmental, and social relationships.

In this scenario, the Global Health It constitutes a commitment that must be maintained, evaluated, and constantly renewed. Its fundamental principles: solidarity among nations, recognition of universal rights, international cooperation, and a shared concern for preventable deaths, require building a sustainable, honest, multipolar, and consensus-based global health system.

But we wonder: how can we better understand diseases and anticipate their transformations?

One answer lies in evolutionary biology and its connection with medicine. Evolutionary biology studies the changes in living beings over time and their relationships of kinship, using tools such as molecular genetics and computer science applied to biology. Evolutionary ecology, for its part, analyzes the interactions between organisms and their environments, including phenomena such as parasitism, cooperation, and mutualism.

This convergence leads to evolutionary medicine, also called Darwinian, which applies the principles of evolution to the understanding of health and disease. Its contribution consists of explaining how our evolutionary history influences susceptibility to certain pathologies, resistance mechanisms, and responses to treatments.

Many diseases can be understood by considering the imbalances between the environments in which we evolve and our current living conditions. Dietary changes, lifestyles, and environmental transformations have generated new health challenges that require preventive approaches capable of integrating biological and social knowledge.

The COVID-19 pandemic is a significant example. The evolution of SARS-CoV-2 highlighted the importance of understanding the transformations of infectious agents to improve epidemiological surveillance, guide health responses, and prepare for future pandemics. It also demonstrated that individual decisions, perceptions of risk, and reluctance to vaccination can influence public health outcomes.

Evolutionary medicine therefore offers tools to drive innovation in biomedical research, clinical care, and health policies. It also allows for studying the mechanisms of vulnerability and resistance to diseases, identifying suitable models for research, understanding resistance to certain treatments, and developing strategies against infectious outbreaks and emerging diseases.

However, understanding the disease requires looking beyond its biological mechanisms. The differences in population health are the result of multiple interrelated factors. Genetic variation, evolutionary history, and socio-ecological context contribute to explaining why certain diseases affect individuals and communities differently.

Genetic variation allows us to investigate the relationship between genotype and phenotype, while evolutionary history helps us understand how different populations have developed biological responses in certain environments. This does not mean that there are essentially different human groups, but that evolutionary trajectories and environmental conditions are part of human diversity.

These factors are added to the social, economic, and ecological conditions that determine the opportunities to prevent diseases, access timely diagnoses, and receive appropriate treatments.

This perspective takes on special relevance in the face of neglected diseases, which primarily affect populations in vulnerable situations and whose prevention, research, and care do not always receive the necessary resources.

Identifying risk groups and understanding their biological and socio-environmental conditions allows for more timely, targeted, and equitable preventive interventions. Global health cannot be limited to responding when a crisis occurs: it must strengthen scientific, institutional, and community capacities to anticipate it.

In a world marked by uncertainty, scientific knowledge constitutes an indispensable tool, but it needs to be translated into public decisions, international cooperation, and actions committed to equity.

Evolutionary biology and evolutionary medicine offer us new possibilities to understand human vulnerability, improve prevention, and guide health responses based on evidence.

Because preparing for an uncertain future also means recognizing that health is a shared responsibility.

The real challenge of global health is not just understanding why we get sick, but transforming that knowledge into health opportunities for all people.

Dr. Alicia Ponte-Sucre