For what it's worth, his experience mirrors mine. I don't itemize down to extreme detail, but my wife and I actually do more cooking at home now in the last 1.5 years than we did previously yet our average grocery bill is actually down about $12 a week this year. Honestly, it's kind of shocking.

And before you ask: No, it's not because we switched from buying prepackaged/processed food to raw ingredients. We just order-out less.

Some of it might have to do with the fact that I live in Chicago, a major logistics hub, in a middle class neighborhood that has price-sensitive consumers and multiple major grocery stores.