Lifestyle diseases such as obesity, type 2 diabetes, cardiovascular diseases, and hypertension have become major public health concerns worldwide. Poor dietary habits, physical inactivity, and unhealthy lifestyles contribute significantly to the increasing burden of these conditions. Nutrition plays a fundamental role in disease prevention and health promotion. This review examines the relationship between nutrition and lifestyle diseases, highlighting the importance of balanced diets, essential nutrients, and healthy eating patterns. The paper discusses current evidence regarding nutritional interventions and their effectiveness in reducing disease risk. The findings suggest that adopting healthy dietary practices can significantly contribute to the prevention and management of lifestyle-related disorders.