Fried food does not directly cause acne – that is if you eat fried food today, you’re not going to break out tomorrow. However, in the long term fried food is very dangerous to your body and skin.
When oil is heated to a very high temperature, the oils and fats in it oxidize – these oxidized fats can lead to inflammation.
Oils that sit and are used over again, like the vat your French fries are cooked in, are really bad, because these fats are thicker and don’t detox from the body easily.
Many restaurants use partially hydrogenated oils for their fried foods because they don’t need to be changed as often.