Healthy eating really does cost more

That's what University of Washington researchers found when they compared the prices of 370 foods sold at supermarkets in the Seattle area. Calorie for calorie, junk foods not only cost less than fruits and vegetables, but junk food prices also are less likely to rise as a result of inflation. The findings, reported in the current issue of the Journal of the American Dietetic Association, may help explain why the highest rates of obesity are seen among people in lower-income groups.

The scientists took an unusual approach, essentially comparing the price of a calorie in a junk food to one consumed in a healthier meal. Although fruits and vegetables are rich in nutrients, they also contain relatively few calories. Foods with high energy density, meaning they pack the most calories per gram, included candy, pastries, baked goods and snacks.

The survey found that higher-calorie, energy-dense foods are the better bargain for cash-strapped shoppers. Energy-dense munchies cost on average $1.76 per 1,000 calories, compared with $18.16 per 1,000 calories for low-energy but nutritious foods.

The survey also showed that low-calorie foods were more likely to increase in price, surging 19.5 percent over the two-year study period. High-calorie foods remained a relative bargain, dropping in price by 1.8 percent.

Click here to read the entire article by Tara Parker-Pope in the December 7, 2007 edition of the New York Times.

Here is an abstract from the originial research:

The rising cost of low-energy-density foods.

J Am Diet Assoc. 2007 Dec;107(12):2071-6.

AUTHORS: Monsivais P, Drewnowski A.

Nutritional Sciences Program, School of Public Health and Community Medicine and Department of Dental Public Health Sciences, School of Dentistry, University of Washington, Seattle, WA 98195, USA.

BACKGROUND: Consuming lower-energy-density foods is one recommended strategy for management of body weight. This cross-sectional study used retail food prices to test the hypothesis that low-energy-density foods are not only more costly per kilocalorie, but have increased disproportionately in price as compared to high-energy-density foods.

DESIGN: For a list of 372 foods and beverages belonging to a food frequency questionnaire database, retail prices were obtained from major supermarket chains in the Seattle, WA, metropolitan area in 2004 and 2006. Energy density of all items was calculated and prices were expressed as $/100 g edible portion and as $/1,000 kcal. Foods were stratified by quintiles of energy density and the differences in energy cost and in percent price change were tested using analyses of variance.

RESULTS: High-energy-density foods provided the most dietary energy at least cost. Energy cost of foods in the bottom quintile of energy density, beverages excluded, was $18.16/1,000 kcal as compared to only $1.76/1,000 kcal for foods in the top quintile. The 2-year price change for the least energy-dense foods was +19.5%, whereas the price change for the most energy-dense foods was -1.8%.

CONCLUSION: The finding that energy-dense foods are not only the least expensive, but also most resistant to inflation, may help explain why the highest rates of obesity continue to be observed among groups of limited economic means. The sharp price increase for the low-energy-density foods suggests that economic factors may pose a barrier to the adoption of more healthful diets and so limit the impact of dietary guidance.

For information about what we actually eat, according to the USDA, click here.