I'm sorry, you spend $650USD per person per month on groceries?? It's been more than a decade since I lived in the US but that's insane. US food costs have historically been lower than Canada and Europe but if your example is close to median/average that is no longer the case... food is my "it costs what it costs" line item and we spend $500CAD per month per person, and we eat well. I don't intend to accuse you of bad spending habits, I'm just aghast at what food prices are down there now!
"Back in my day" when I worked grocery (2015) in small town USA people's weekly shopping trips at my store would be 75-200 USD, presumably for 2 adult + 0-2 kids.