Dietary habits, particularly the consumption of high-glycemic-index foods and dairy products, have been linked to acne severity, possibly due to their role in insulin-like growth factor 1 (IGF-1) signaling, which can exacerbate sebum production and inflammation [28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43]. This evidence concerns the gene IGF1 and acne.