Erythritol is a natural, low-calorie sweetener favored in food, beverage, and healthcare products. While it contributes minimal calories and is poorly metabolized, emerging studies suggest high blood erythritol levels may be associated with weight gain and fat accumulation. This article reviews the science behind erythritol, its metabolic effects, safety, and its role in weight management, providing industry insights and answering common questions to guide both manufacturers and consumers.