This topic and the many factors involved interest me, so thanks to you, Nancy, for posting the article link and initiating the discussion.
I call bullshit, however, on one particular aspect of the article: point #4, "Healthy foods can cost more" and its accompanying chart. If the premise is that fruits and vegetables are the healthiest foods, then clearly they cost no more, according to that chart, than eggs, fats, and oils; they cost slightly less than dairy products, sugar, sweets, and beverages; they cost even less than beans, legumes, and grains; and they cost considerably less than meats, poultry, and fish. If, on the other hand, the premise is that beans, legumes, and grains are the healthiest foods, then yes, they cost more than most other foods, except meats, poultry, and fish. The premise of the subtitle is really only true if you think meats, poultry, and fish are the healthiest foods, as clearly they're the most expensive. All of this is clear from the values on the vertical axis in $/100 g.
Using the information in that chart ($/100 g from the vertical axis times 1/(kcal/100 g) from the horizontal axis), the food groups shown ranked in order from most energy density per unit cost (kcal/$) to least are fats, grains, legumes, eggs, milk, sugar, meat, vegetables, and fruit (1130, 755, 640, 533, 450, 331, 299, 240, and 218 kcal/$, respectively).
So I think the horizontal axis, kcal/100 g, is a red herring, at least as far as the point the text labors to make. The premise in the text is that people of strained financial resources will spend their money on the most energy-dense foods per dollar available. If that were true, they'd be consuming all the fats, oils, grains, and legumes they could get their hands on in place of not only fruits and vegetables but also eggs, dairy products, meats, and sweetened foods and beverages. I don't think that's really happening.
Just in terms of food group choices (not to mention societal factors others have mentioned) I think there are other things at play. Beans, legumes, grains, fats, oils, and sweetened foods and beverages are fairly shelf-stable; meats, dairy, eggs, fruits, and vegetables require refrigeration. Fats and oils are quickly satiating; fibrous foods like beans, legumes, fruits, and vegetables are quickly filling. But I think they key problem--as far as comparing food groups goes-- is that group in the middle of the chart: the relative cheapness and taste desirability of relatively nutrient-poor sweetened foods and beverages. People don't tend to go into 7-11 to buy tubs of butter or margarine and whole-wheat bread and cans of beans because those are what will give them the most energy for their dollar to get through the day (although they would); they go in to buy Big Gulps of soda (because that's what they want).
Not that it isn't necessarily true that healthy foods cost more, but this chart is not the way to show it. I think a chart of cost per unit weight ($/100 g) on the vertical axis vs
nutrient density---on some scale such as a 0-100 normalized nutritional ranking/100 g---on the horizontal axis would be more insightful and would better make the point the authors want to make.
Last edited by
Katie on August 12th, 2018, 8:09 pm, edited 1 time in total.
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