It may be a myth that French fries cause pimples, but that doesn't mean your eating habits don't affect your skin. First, maintain a healthy weight, since obesity has been linked to acne in both teenagers and adults [source: Tsai]. This is likely because weight gain prompts hormonal changes that increase androgen, which in turn accelerates sebum production [source: O'Connor].
Recent studies have suggested that high-glycemic foods, such as bread and candy, rapidly raise glucose levels, unleashing hormones that stimulate oil production [source: Aubrey]. If you're prone to acne, you might consider trying a reduced-carbohydrate diet rich in protein, vegetables and whole grains. Experts think frequent dairy consumption might also trigger breakouts, so cut back on the milk and cheese too [source: Burris].
To promote healthy skin in general, doctors and nutritionists recommend drinking plenty of water, eating lots of antioxidant-rich fruits and vegetables, and choosing foods that are high in omega-3 fatty acids [source: Uscher]. You should also avoid artificial colorings, flavorings, preservatives and sweeteners [Daily Mail].