Yes, McDonald's French fries do contain a small amount of sugar. While the primary ingredients in McDonald's French fries are potatoes, vegetable oil, and salt, they also include a small amount of dextrose, a natural sugar derived from cornstarch. Dextrose is commonly used in the food industry to enhance flavor, promote browning during cooking, and improve the overall texture of the product. However, it's important to note that the amount of sugar in McDonald's French fries is relatively low and is primarily present for culinary purposes rather than for sweetening the fries.