Gee, it's almost like studies of Millenials/modern youth culture are at best skewed for various reasons and at worst complete and utter equinoid excrement created just to complain about teh damn kids these days.

It's saying that millennial aren't buying as many groceries, which they would cook at home, but they're also not going to as many restaurants, so they're not eating out either. So where are they getting their food?

Clearly they are consuming the flesh of all the industries they've killed. Or they're gardening/farming more.