Smart Money has produced a most instructive display of the cost of 100 calories in meals at fast food restaurants. Click on the numbers starting with #1 (for which you have to click on #2 – the numbers are off by 1 for some reason). #1 is the most expensive: $1.47 per 100 calories for at McDonald’s Southwest Salad with Grilled Chicken. # 13 (click on #14) is a Burger King Double Whopper with Cheese at 49 cents for 100 calories but you have to buy 1010 calories at this price. The cheapest, #15 (click on #16) is a 32-ounce Coca-Cola at 38 cents per 100.
It would be interesting to do the same thing for nutritional value. Could nutrients (other than calories) be proportional to cost? That idea might be worth a closer look.