As an American who lived in Brazil for 8 years, honestly I'm not sure this is any worse than traditional food. A typical Brazilian lunch is a piece of meat with beans, sides of rice, french fries, and fried flour (farofa) -- that's right, 3 carbs of empty calories (2 fried) and no real vegetables -- all washed down with mostly-added-sugar "fruit juice concentrate" (cashew apple is really common). Bar snacks are 100%…
First of all, the juice concentrates are a newish thing, 20 years ago it was still common to make fruit juice from scratch at home every day. Also, farofa is fried (more like sauteed, it doesn't need that much oil) yucca flour, which is a world away from refined white flour. Growing up, lunch was a large salad along with rice, beans, a cooked vegetable and some kind of meat or fish.
I fully admit that Brazil really took to fast food and it's just as terrible as it is anywhere, but your analysis of "traditional" Brazilian food is quite myopic and probably influenced by your own white-collar professional tendencies towards convenience foods.