Yes, a balanced, healthy and fresh diet will facilitate both in the rejuvenation of the tissue after a workout, and also increase the amount (and quality) of blood inside the penis - further increasing growth. Additionally, there are numerous herbal supplements that further aid your health; some are particularly helpful to the penis and your libido, and all of them have numerous health benefits. Here are few that I take and a very popular: Ginkgo Biloba, Saw Palmetto, Ginseng, and here’s some more . Take a look; the right diet and intelligible usage of supplements improve the health of your penis as well as your general health, well-being, mood, sleep, energy, intelligence and so forth. I recommend this book, called the ‘Optimum Nutrition Bible’, by Patrick Halford (UK version ). The earlier you know about this stuff, the older you shall live and the happier you shall be.
"Optimum nutrition is the medicine of the future." Dr. Linus Pauling, twice Nobel Prize winner.