A low-calorie diet involves reducing daily caloric intake to promote weight loss and improve health. It focuses on nutrient-dense, low-calorie foods such as fruits, vegetables, lean proteins, and whole grains while limiting high-calorie foods like sugary snacks, processed foods, and unhealthy fats. The goal is to create a calorie deficit, where the body burns more energy than it consumes, leading to weight loss. This diet emphasizes portion control, balanced nutrition, and mindful eating to support sustainable weight management while still providing essential nutrients for overall health.