Organic Produce protect themselves by producing phytochemicals

A different story is playing out with organic produce. "By avoiding synthetic fertilizers, organic farmers put more stress on plants, and when plants experience stress, they protect themselves by producing phytochemicals," explains Alyson Mitchell, PhD, a professor of nutrition science at the University of California, Davis. Her 10-year study in the Journal of Agricultural and Food Chemistry showed that organic tomatoes can have as much as 30 percent more phytochemicals than conventional ones.

Unlike prematurely picked supermarket produce, which typically travels hundreds of miles before landing on store shelves, a farmers' market or pick-your-own venue offers local, freshly harvested, in-season fare that's had a chance to ripen naturally—a process that amplifies its amount of phytonutrients, "As a crop gets closer to full ripeness, it converts its phytonutrients to the most readily absorbable forms, so you'll get a higher concentration of healthful compounds."