This article points out the importance of choosing organic produce for a variety of fruits and vegetables that are consumed on a regular basis by most people. Unfortunately, when staple foods are laced with pesticide residues the cumulative effects of all of them together can pose quite a burden to the body's detoxing abilities.

A handy little tip is to keep a little card with you in your purse or wallet with the list of fruits and veges that are the most important to buy organic so you can refer to it when shopping.
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Pesticides & Organics
Is it worth it to buy organic?

Rocky Mountain News, Lisa Ryckman
Published October 23, 2007

Sometimes, but not always.

An analysis of 100,000 federal pesticide tests by the Environmental Working Group, a nonprofit research organization, found that some produce is simply more contaminated. The group's study found that people are exposed to about 20 pesticides a day eating the "dirty dozen": apples, bell peppers, celery, cherries, imported grapes, nectarines, peaches, pears, potatoes, red raspberries, spinach and strawberries.

Scientists disagree whether the low levels of contaminants you're exposed to in conventional produce would be harm- ful. But if you'd rather not take chances, it's probably worth it to pay more for organic varieties of those fruits and veggies, particularly if you have kids.

But it's probably not worth it to spend more for asparagus, avocados, bananas, broccoli, cauliflower, sweet corn, kiwi, mangos, onions, papaya, pine- apples and sweet peas. Research by the EWG found that pesticide residues are rarely found on those.

http://www.ewg.org/node/25505