If the "Dollar Menu" extended across every grocery store aisle, what would it buy you in calories? If Tuna steak is your taste, $1 buys you 28 calories. If you prefer soda, Coke packs 447 calories per dollar. A dollar's worth of lettuce has just 16.5 calories.

Over the last few decades, the lettuce has gotten more expensive and the burgers and coke have gotten cheaper. The cost of fresh fruits and vegetables is up 40 percent in the last 30 years. The cost of butter and soda is down 30 percent over the same time period.

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