Calorie restriction can have several effects on metabolism, including reductions in the basal metabolic rate (BMR) and potential loss of lean muscle mass. When the body perceives a caloric deficit, it may slow down metabolic processes to conserve energy, making weight loss more challenging over time. Prolonged calorie restriction can lead to adaptations that hinder metabolic rate further, causing plateaus in weight loss. Therefore, it’s crucial to approach calorie restriction thoughtfully, ensuring adequate nutrient intake to minimize negative impacts on metabolism while still promoting effective weight loss.