New research suggests that eating a diet that is rich in fruits and vegetables actually gives you a healthier glow than the sun. In the photo below, the middle image shows the woman's natural skin tone. The image on the left shows the effects of the sun and the image on the right shows the results of a diet rich in fruits and veggies (specifically those high in carotenoids like carrots and tomatoes). Participants in the study thought that the fruit and veggie glow looked healthier.
Don't forget to get some sun too, though- you need your vitamin D!
The full article, here, is worth a read.