Higher intakes of vitamin C and linoleic acid and lower intakes of fats and carbohydrates are associated with better skin-aging appearance.
"Dietary nutrient intakes and skin-aging appearance" - abstract from a research paper published by Unilever (UK) in the American Journal of Clinical Nutrition. Access to the full article requires a subscription.
abstract Vol. 86, No. 4, 1225-1231, October 2007