Reasons for eating organic are pretty obvious-less exposure to pesticides, hormones, antibiotics and chemicals that have been shown to negatively impact the body. Certified Organic guarantees the product is GMO (genetically modified organisms) free. Organic foods have just recently been shown to offer higher nutrient levels than their conventionally grown counter parts.
These are good reasons why eating organic is good for you. But organic foods also have a positive impact way beyond your plate and mouth: Organic farming improves water quality by avoiding pesticide and over fertilizing run off. It also improves soil quality by using proper soil management and avoiding chemicals that break down the soil and cause soil erosion. Organic farming is safer for all other animals and birds, including in the wild. It also saves energy which reduces CO2. Organic farming helps restore biodiversity and protects future generations. Lastly, there is a chance you are patronizing your local organic farmer, reducing transportation costs and helping preserve your community.For some supportive reading, try : Omnivore's Dilemma by Michael Pollan
If you really want to jump in, go to: www.localharvest.org to find your local CSA (Community Supported Agriculture). This is a fantastic program where you support your local farmer by paying up front. In return, you receive a weekly amount of farm fresh food during the growing season.
If the cost of some organic foods seems high you might want to keep in mind the top dirty dozen for health reasons. See: http://www.foodnews.org/walletguide.php