What sugar substitute is often used for lower-calorie candies?

Aspartame is a commonly used sugar substitute in lower-calorie candies due to its sweetness intensity, which is significantly greater than that of sucrose (table sugar). It provides a sweet flavor without the high caloric content associated with sugar, making it an attractive option for manufacturers aiming to reduce calories in their products. This is particularly beneficial in the diet and health-conscious segments of the candy market. Aspartame is often found in products marketed as "sugar-free" or "diet," allowing consumers to enjoy sweet flavors without the added calories from sugar.

The other options, such as sucrose, fructose, and glucose, are all natural sugars that contain calories and do not offer the same benefit as aspartame when it comes to reducing caloric intake in candies. These sugars contribute to the overall caloric content of the products in which they are used. Therefore, while they may provide sweetness, they do not qualify as lower-calorie substitutes in the same way that aspartame does.