Ok, so if you eat as much as you want of home-cooked bacon, eggs, and fresh-sliced potatoes fried in lard you'll lose weight? Or is that not "real food"?
No, it's not as simple as avoiding packaged food. And even if it were, avoiding consuming all that crap may be simple but it's not easy. It takes a lot of willpower. If that's easy for you, you're in a tiny and fortunate minority.
The human body is a complex system with all sorts of feedback loops on inputs and outputs that can make it extremely difficult to change its equilibrium.
Calling people lazy when in fact they're losing a fight against every instinct of their biology (plus all sorts of societal ills like long work hours and food deserts and advertising) is unproductive.