The most obvious difference between traditional and oil-free sweet potato fries is that the latter are lower in fat and calories. Once heated and especially when deep-fried, oil can create trans fats which should be kept to a minimum in our diet. Munching on these oil-free sweet potato fries contributes more to healthy weight loss or maintenance compared to many other snacks, plus they are rich in fiber, vitamin A and vitamin C. However, you can spray some oil on your fries before baking them for some added crispiness and extra calories — something that can be important when feeding kids a plant-based diet.