FarmWeek, a publication of the Illinois Farm Bureau, has a great guide to determining which color of produce will give the maximum nutrition.

Here is a quick synopsis:

• Deep reds and bright pinks (tomatoes and watermelon) contain lycopene, an antioxidant that has been suggested to fight prostrate cancer.
• Greens can protect the eyes (spinach, collards, kale and broccoli) and may reduce the risk of cancerous tumors (cabbage, brussel sprouts, turnips, and cauliflower)
• Orange contains beta-carotene, vitamin C and vitamin E. Everyday, eat oranges, sweet potatoes, carrots or apricots
• Blues/Purples have flavonoid, phytonutrients and antioxidants. Blue may also ward of harmful carcinogens. Blueberries taste great and should be part of your daily diet.

The full artice is available here.

Remember, it is ALWAYS better to get your nutrition through natural foods than through pills and processed drinks.