I work in healthcare and this is my understanding from the responses of patients that I encounter - fast food is cheap. One of the families I work with, both parents are diabetic and the children are all overweight. I asked them about their eating habit and the answer was : McDonalds for breakfast, lunch, and dinner. Why? Because it's cheap to eat at McDonalds for a family of 4 than it is to buy vegetables at the mar…
This excludes meat and dairy products though.