Sure, but they don't give you the serotonin rush that McDonald's does. The fat+salt+sugar+carbs+MSG combinations is a very affordable drug these days. With more resources you can adopt healthier pleasures. Poor people don't have that luxury.

It's very easy for people with confortable lives to prescribe rational choices for the less fortunate, as if they were characters in the sims. But they are human beings with all the usual human flaws like the rest of us, and they want their day to be less miserable, like we would.