Maybe if you live in an area with great access. In a lot of places, fresh fruit and veg is comparatively expensive. Even if it's extremely reasonable you have to take cost per calorie into account, if you're on a very restricted income and feeding an entire family, a bag of frozen fries is going to go a lot further in filling your kids up than a bunch of low calorie fresh vegetables. Then you have to take increased wastage into account, this can be a big factor if you live alone, when I lived alone I always bought frozen veg to avoid that. Unhealthy food is generally cheaper to feed a family on than "real" food, especially when you consider what crops get subsidies...hint, it ain't fresh carrots. It's sugar. This has pretty much been widely documented across the board and in many countries.