Hannah Niu, marketing manager at Xiaomi explains that "the oil inside the food is thoroughly fried through the 360-degree heated air circulation, providing delicious food with less grease and fat." Niu also adds that the technology within an air fryer results in food that's cooked through and crispy on the outside.
The exception in our experience of testing is that if you're going to make homemade chips, a little oil goes a long way in ensuring your chipped spuds have a golden and crispy exterior.