Frequent, rapid rises in blood sugar can cause inflammation, which can show up on skin. Even simple carbohydrates such as white flour, breads and pastas can have this effect. The jury is out on milk's effect on the skin. While eating low-fat dairy products can boost skin health because they're rich in Vitamin A, many dermatologists recommend going easy on low-fat milk itself. The bovine growth hormones present in milk present problems when they activate the endocrine system, but lactose can present as skin problems in people who are intolerant. Eat a balanced diet with antioxidant-rich foods, plenty of water and monounsaturated fats - not saturated, which can exacerbate skin problems - to keep skin smooth and healthy.