The BBC reports:
Dr Ian Stephen who led the research believes eating carrots and tomatoes made you look better than a tan would. Dr Stephen explained: "Eating five more portions [of fruit and veg] ups your carotenoid levels giving your skin golden tones." Carotenoids are antioxidants which soak up damaging compounds that the skin encounters in daily life.
Students at the University's Malaysian campus, where Dr Stephen is based, ate five extra portions of fruit and vegetables a day for two months. Afterwards students examined a variety of pictures where their skin had different pigmentations and deemed themselves more attractive when they had increased their vegetable intake.