Recent research highlights that health is shaped long before individuals enter the healthcare system. Healthy behaviors are often learned in various parts of life, including at home, in schools, sports clubs, and within communities. This suggests that health is not just a matter of medical care but is deeply influenced by everyday environments and experiences. However, many administrative systems, especially those inherited from the 20th century, are not well-suited to address the growing emphasis on prevention and the complex factors that influence health today. Public discussions increasingly focus on prevention, yet the healthcare system still tends to act only after diseases have already developed. This creates a paradox, as modern health challenges demand a shift from reactive care to proactive measures. For decades, health policy in France has concentrated on ensuring access to medical care, which has helped extend life expectancy. But this approach has not fully addressed the broader, long-term factors that determine health outcomes. The 21st century presents a new challenge: protecting and strengthening health from an early age. However, policies related to health, education, youth, sports, and digital environments often operate in isolation, which limits their effectiveness, especially for children. The main threats to health are not only diseases themselves but also living conditions, such as mental health, nutrition, physical activity, sleep, screen exposure, and social inequalities. These factors have a lasting impact on health and are often linked to non-communicable diseases, which cause around 75% of global deaths. The World Health Organization (WHO) has stressed that health outcomes are more influenced by living conditions than by the quality of healthcare alone. Prevention is now seen as the first line of defense against non-communicable diseases, which often begin long before symptoms appear. This is especially relevant for mental health, which is increasingly affecting young people. In 2025, the WHO estimated that one in seven adolescents had a mental disorder, with most cases emerging before the age of 25. In France, a report by Terram & Institut Montaigne underscores the need for a stronger public response, but current interventions often come too late, after problems have already developed. Prevention involves more than just medical care—it requires addressing the root causes of health issues. For example, physical activity is a key component of health, with the WHO recommending at least 60 minutes of daily activity for children and adolescents. However, in 2024, only 33% of girls and 51% of boys aged 6 to 17 met this recommendation. Prevention also includes helping young people understand and navigate their environment, which requires better health and media education to combat misinformation. To effectively address these challenges, health policies must be reorganized to reflect the interconnected nature of health determinants, including education, sports, social, environmental, and digital factors. The current administrative structure is not equipped to handle this complexity. A proposed solution includes creating a new ministry focused on health, prevention, youth, and sports to better coordinate these efforts. Additionally, health should become a guiding principle in broader economic, industrial, and environmental policies, recognizing that health is not only the concern of the healthcare system but also a shared societal responsibility.