Using the convection heating method that involves air circulating inside the unit, an air fryer technically doesn't fry the food it uses this hot air to cook the food and give it a crispy taste and toasty brown colour. The food goes into a basket and as it is cooked the excess fat drips into a pan below, that oil that drips away would have ended up being consumed at least most of it if not all of it
The process the air fryer employs uses a lot less oil to begin with too, as a thin layer of oil is applied to the food instead of it being immersed in a vat of hot oil like in traditional fryers! Some kinds of oils are beneficial but still better off getting that advantage from foods not fried in it. Maybe some olive oil on your salad would do better there.
Less oil also means fewer calories which is helpful for those looking to lose weight and still being able to enjoy some fried food without maxing your calorie intake is a blessing, in the form of the air fryer!
There is a difference in the cooking time so if fries take about 6 minutes in a deep fryer but in an air fryer they would take around 12. Deep-fried chicken takes about 15 to 20 minutes and in the air fryer it would take up to 25 minutes. This being the one slight drawback.
If a healthier lifestyle is what you are aiming for, just buying an air fryer won't change too much. You will also need to keep an eye on what you eat and the quantity of consumption! Philips, Black & Decker and Anex produce air fryers with varied designs and price ranges.