Food for Thunk

Here I go again. Food . . . love it, savor it, spice it up, buy it in bulk, eat it in bulk, puree it, bake it, fry it, dip it in sauce or pickle it. Any way you prepare it, the end result is the same: We take in more calories than we use. The problem seems simple enough, however, in an environment where consumables are center stage and all else is a secondary offering, cranking back on all the savory, succulent food choices is more than difficult, it's darn near impossible. 

So what is a healthy amount of food?  What matters more, the quantity of a food or the quality of the macronutrients (that is, the amount of saturated fat per serving).  Or is the status of the consumer of said food the ultimate determinant of a healthy versus an unhealthy food.  If I run a marathon daily will I be a healthier person overall even if I eat the above giga-burger with fries?  Compare that notion to another individual living a sedentary life, sitting at home watching television eating carrots and lettuce (and not eating the burger).  Which of the two options is healthier overall?  Think carefully omnivores.