Garbage food (high fat, sugar, etc.) is cheaper, without a doubt.
I disagree.
Option 1) For $10 I can get two biggie Big Mac Meals: Big Mac, Large Fries, and Large Coke. At Mcdonalds.com this is 1350 calories, and 83 grams of fat. Even medium fries & Coke is 1130 calores, 48g fat!
Option 2) For $10 I can get a pound of lean ground turkey for turkey burgers ($4), whole-grain buns (~$2), and the remaining $4 on veggies (not all are expensive, like lettuce & carrots).
1/3 pound of turkey burger, 225 calories, 4g fat (from http://www.nutritiondata.com/facts/poultry-products/931/2)
1 slice American cheese, 50 calories, 3g fat (http://www.nutritiondata.com/facts/dairy-and-egg-products/7648/2)
1 bun, 113 calories, 3g fat (from http://www.nutritiondata.com/facts/baked-products/5108/2)
1 serving carrots, 30 calories, 0g fat (http://www.nutritiondata.com/facts/vegetables-and-vegetable-products/3026/2)
1 service lettuce, 14 calories, 0g fat (http://www.nutritiondata.com/facts/vegetables-and-vegetable-products/2475/2)
1 ounce lite italian dressing, 21 calories, 2g fat (http://www.nutritiondata.com/facts/fats-and-oils/493/2)
And drink water or unsweet tea, 0 calories
TOTAL: 453 calories, 12 g fat! All for about $10 (oh, and actually has nutritional value)
This is how I eat. No more expensive. Just takes a desire to be and look healthy.