Surprises: Organic v. Conventional Produce

The information below and other helpful posts are on my blog: www.movingstronglyforward.typepad.com.

Luke McMullan, a great person, friend, and owner of Branches Ecological Designs www.branchesnc.com, answered my plea for help in getting to the root of the organic vs. non-organic produce debate. He generously took the time to give me his thoughts. Thank you so much, Luke! You are helping many people!!

Here are Luke’s thoughts:

Laura asked me to talk about plant uptake of heavy metals so that is sort of what I will do. It is generally assumed that organically produced food is relatively non-toxic, while we need to worry about the toxicity impacts of conventional food. Guess what? Worrying is a waste of time, but if you’re going to worry you should worry about both. We know that chemical fertilizers contain significant levels of potentially toxic metals such as lead, mercury, cadmium, nickel, zinc, and arsenic, which in turn accumulate in the soil and are taken up by plants. What you don’t usually hear about are the organically approved natural fertilizers such as composted manure, rock phosphate, greensand, guano, and fish emulsion, which

• contain the same heavy metals
• accumulate in soil
• are taken up by crops.

The difference? This time the chemicals end up in the body of someone who thinks they are eating something healthier.

Several studies in Europe show that levels of heavy metals in organic food are sometimes twice as high as levels found in conventional food, yet there seems to be fairly dramatic variability. The species and variety of plants have a somewhat significant role in determining the potential levels of heavy metals per unit of nutrient; however, there are some other far more important factors to take into account, foremost being the level of heavy metals in the soil.

Several decades ago we knew very little about the toxicity of many of these metals or their potential to end up in our food supply, so agricultural pesticides loaded with lead and arsenic were dumped into the soil. These pesticides along with deposits from other industrial chemicals ended up leaving their heavy metals in the soil and there they remain until some plant picks them up to escort them into the food chain. This can happen either by eating a stick of celery grown in contaminated soil or a hamburger from a cow that ate grass or grain grown in contaminated soil.

Ugh. So what is a consumer supposed to do? When food is from a factory (grocery stores stock mostly factory farmed food) we have no idea what we are getting. But that does not have to be the case for you. A good start is to know the people who grow your food and the land where it is grown. Or better yet get to know the soil where you live and produce a portion of your food sustainably.

More thoughts from Laura

Luke is going to help my family prepare to grow some of our own food. He is a talented organic farmer and landscape designer who focuses on creating beautiful, healthy gardens that require little maintenance and produce wonderful food. Luke offers in-person consults, over-the-phone coaching and a monthly newsletter. You can reach him at: branches.landscapes@gmail.com to sign up for his newsletter or inquire about services.

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