Food = Fuel
Mirriam-Webster Definition
Food    \ ˈfüd \   
material consisting essentially of protein, carbohydrate, and fat used in the body of an organism to sustain growth, repair, and vital processes and to furnish energy; also : such food together with supplementary substances (such as minerals, vitamins, and condiments)
       If I was to point my finger anywhere, it would be to marketing.  In this modern world we have a misconception about food as being trendy.  We have been led in this direction because we have been given images about purchasing, consuming and preparing our meals.  We don't see the worth of what we put into our mouths.
     It is my opinion that it started around mid 1900's when the first full service groceries stores began opening.  There began the marketing to consumers, mostly housewives, to buy not for nutrient but for convenience, for their buying power. 
    It has snowballed into convincing us low cost or the monetary value is more important than our health.  So we cannot blame our mothers or even our grandmothers that we are a generation that don't understand the power of food.  
     I read somewhere recently, that the next generation is the first that won't live longer than the previous.  Much of this because of illnesses related to poor diet choices  (A great read).  If there is one thing I want you to walk away from reading this and remember,

“The food you eat can be either the safest and most powerful form of medicine or the slowest form of poison.”
                                                                     - Ann Wigmore

This is what our bodies don't want:
     -processed food
     -processed sugars
     -simple carbs like white flour baking

This is what our bodies do want:
     -water (not pop or sugar enhanced drinks)
     -proteins (and it doesn't have to be all meat)
     -complex carbohydrates and natural fats