I was looking for this uninformed and incorrect statement.
"Junk Food" and Fast food tends to be between 100-300 Calories Per Dollar. Fresh Fruit and Vegetables are in this same range.
This doesnt include that homecooked meals are 200-300% cheaper than junk food. A meal with Chicken Rice and Veggies are closer to 600-700 calories per dollar and have protein and nutrients.
There is obviously a time aspect, but that isnt what is discussed in the quote.
My expertise is food, source- http://efficiencyiseverything.com/food/