Obesity is a critical global health issue, with escalating prevalence over the past few decades. This review discusses the importance of dietary approaches in managing obesity, focusing on evidence-based strategies for weight loss and long-term health outcomes. Key interventions include low-calorie diets, very-low-calorie diets, and meal replacement programs, which have demonstrated varying efficacies in achieving weight reduction and improving metabolic health. Macronutrient-focused approaches such as low-carbohydrate, high-protein, and low-fat diets offer flexibility, and long-term results often depend on individual adherence. The quality and source of macronutrients are emphasized for achieving long-term health outcomes. To improve adherence to dietary therapy, time-restricted eating can be considered based on an individual’s lifestyle and health conditions. Emerging evidence supports dietary patterns such as the Mediterranean, Dietary Approaches to Stop Hypertension, vegetarian, and Nordic diets to improve cardiometabolic profiles. Personalized dietary interventions are crucial for sustainable lifestyle changes and the optimization of weight management.