extra cost part II

[S.Annadana]

Why would organic foods have higher nutrient levels?

Despite disagreements over the benefits of organic foods, scientists are beginning to understand why they frequently contain more nutrients. The simplest reason is that often, organic food is produced locally and is therefore fresher. “Fresh and nutritious go hand in hand,” Lammel-Harmon said. That’s because vitamins, antioxidants and other nutrients die over time.

Local food also has a lower risk of damage and contamination during shipping, simply because it’s not traveling as far, she added. That doesn’t mean that organic food is immune from microbiological risks, however. The spinach involved in the 2006 E. coli outbreak was grown on a farm that was in the process of switching to organic. In that outbreak, at least three people were killed and 102 were hospitalized, of 199 recorded infections in 26 states, according to the U.S. Food and Drug Administration.

Aside from freshness, the way that organic food is cultivated also appears to have an impact on its nutritional value, Winter said. Organic fruits and vegetables tend to grow more slowly because they do not use synthetic fertilizers. When plants are growing too quickly, they put most of their energy into getting bigger, rather than into developing a richer biochemistry, which may include antioxidants, he said.

The other positive impact is counterintuitive: Organic fruits and vegetables grow under greater conditions of stress. Since organic farmers aren’t allowed to use some of the conventional methods of fighting off disease and insects, plants have more to fight against, Winter said. With higher levels of stress, plants often produce more polyphenolic compounds, chemicals that defend plants against wounds, herbivores and stress due to photosynthesis. In humans, they act as antioxidants.

As for organic meat, national guidelines require a number of practices that are associated with more humane treatment, Benbrook said. Animals are exposed to less stress – they spend more time in the pasture and are less likely to be pushed to produce a specified amount of milk or eggs per month.

These factors contribute to healthier foods being produced by these animals, Benbrook said. Organic milk tends to have higher protein content and higher levels of heart-healthy fats such as Omega-3s, he said. Omega-3s are often associated with fish, but meat from grass-fed animals tends to have higher levels as well.



Do organics limit pesticides and environmental impact?

In addition to the extra antioxidants, many people choose organic food because chemical pesticides are prohibited in organic growing.

But even organic food has some residual pesticides, Lammel-Harmon said, because the chemicals are already in the air. “There’s nothing the farmers can do about it,” she said. That might not be a major problem, however. Current research shows that the level of pesticides associated with the food we eat is unlikely to cause harm, experts said.

“There’s no evidence that the residues of pesticides and herbicides found in foods really increase the risk of cancer,” Rosenberg said. She stressed the importance of thoroughly washing fruits and vegetables to lower the risk. “My guess is that most pesticides don’t do a lot of harm [in the amounts we consume them], but it’s inconceivable that they do nothing.”

Winter, the food toxicologist, said scientists have conducted tests that exposed animals to 10,000 times our daily exposure to pesticides, and it was an insufficient amount to cause any negative long term effects. “It’s not the presence, but it’s the amount that’s important,” he said.

Since that’s the case, the benefits of consuming lower pesticide levels in organic food alone might not be enough to justify a switch.

The risk is higher for people who work commercially with pesticides. Since they come into contact with high concentrations of pesticides on a regular basis, these people have higher rates of asthma, leukemia and certain other types of cancer than the general population, Rosenberg said.

Additionally, the lack of chemical pesticides reduces harm to the environment. “Pesticides are not completely clean in their track record,” Winter said. “You can find them in water, in soil, in places where we don’t want them.” But pesticides known to cause severe environmental problems are already restricted, even for conventional farmers.

Fertilizers allowed in organic food are typically much less potent than those that conventional farmers use, Benbrook said. They’re also more costly, so farmers are limited in the amount of fertilizer they can use. They must spend more time and effort building the innate fertility of the soil. This incidentally ties up large amounts of carbon in the organic matter, which can help combat global warming, he said.



Paying the price

Sales of organic foods reached $13.8 billion in 2005, according to the Organic Trade Association, but with the rising overall cost of food can consumers really afford to pay extra for organics?

Rosenberg likened organic food to a high-priced country club, and traditionally-grown foods to the YMCA: If you exercise at either place consistently, it’s good for your health. But only the people with the highest income levels can afford to go to the country club all the time.

“I’m being practical,” she said. “Eat as many fruits and vegetables as you can and control your weight. If you choose to go organic, don’t buy organic fruits and vegetables and then go for the cheeseburger. You still have to talk about calorie control and choosing meats versus vegetables.”

And if your budget is limited but you still like the idea of organics, Lammel-Harmon recommended choosing the organic foods that have the most nutritional impact. Fruits and vegetables with thin skin or no skin are smart buys, since they have a higher risk of cross-contamination and pesticides. That would include things like peaches and strawberries. Fruits and vegetables with a thick peel, such as avocados or bananas, have a lower risk.

She also recommended buying fruits and vegetables at the peak of the season, when they’re not only the freshest, but also the least expensive.

People start off choosing organic food to protect their family’s health, Rosenberg said. But “a growing number of people are willing to pay for organic for other reasons – to support the environmental ethic and more humane animal husbandry.”

The decision is about balancing all those concerns with the added cost. But if you keep an open mind, you will find that the cost difference isn’t always black and white. At a local Dominick’s in early June, organic baby spinach, at 79 cents per ounce, was more than twice as expensive as its non-organic counterpart, at 33 cents per ounce. Organic oranges, on the other hand, were 10 cents per pound less expensive than non-organic navel oranges, at $1.69.

“We’re fortunate in that we do have the options,” Winter said. “If people do feel very strongly about organics they have the option to purchase these things. It’s a value issue.”