Prof. Ali A. Moosavi-Movahedi, Chairman of the Department of Basic Sciences, states in his editorial in the book “Rationality and Scientific Lifestyle for Health”, published by Springer in 2021: When we hear the word “stress,” we often think of psychological pressure. However, in modern science, stress is not merely a mental feeling. From the perspective of biophysics and molecular biology, stress refers to any factor that disrupts the natural balance of cells and the vital systems of the body. One of its most important manifestations is oxidative stress, a condition directly linked to increased free radicals and reduced defensive capacity of the body. Free radicals are highly reactive, unstable molecules naturally produced in the body. To neutralize them, the human body relies on its defense systems and antioxidants. But when the balance between the production of free radicals and the body’s defensive ability is lost, oxidative stress develops, creating the conditions for cellular damage. Today, sources of stress extend far beyond psychological concerns. Consumption of industrial foods, preservatives, artificial beverages, air pollution, electromagnetic waves and certain types of radiation, urban noise pollution, poor sleep, tobacco use, and even excessive use of synthetic fragrances can contribute to increased oxidative stress. As a result, the modern human body is constantly exposed to hidden molecular pressures. Interdisciplinary research shows that oxidative stress can play a major role in the development of many chronic diseases, including heart disease, neurological disorders, premature aging, and especially type 2 diabetes and its complications. Studies conducted at the UNESCO Chair on Interdisciplinary Research in Diabetes at the University of Tehran emphasize that type 2 diabetes is not merely a “sugar disease,” but to a great extent a disorder related to lifestyle, cellular and molecular stress, and imbalanced free radicals. This new perspective highlights that human health is not limited to a single organ or test result, but is the outcome of a complex balance among the body, environment, and lifestyle. Among the body’s protective mechanisms, antioxidants play a critical role. Many people assume antioxidants come only from fruits and vegetables, yet a significant portion of the body’s antioxidant defense is produced internally. One of the most important examples is melatonin, a hormone secreted in the dark during sleep. Melatonin not only regulates sleep but also has strong antioxidant properties that help protect cells. It is synthesized from serotonin, a molecule associated with happiness, calmness, and emotional balance. Interestingly, a large portion of serotonin is produced by the gut microbiome. This reveals the deep connection between gut health, mental wellbeing, and high-quality sleep. Modern science increasingly demonstrates that a healthy lifestyle is not a luxury but an inherent part of human biology. Regular sleep, natural nutrition, reduced consumption of processed foods, physical activity, avoidance of noise pollution, stress management, and maintaining healthy social relationships can help preserve the molecular and cellular balance of the body. In truth, a healthy person is not merely someone without disease, but someone who maintains harmony among mind, body, environment, and the natural rhythms of life. Perhaps the most important message of contemporary biophysics is that health results from the coordination and balance between the biomolecules and cells of the body and the lifestyle of the individual.