Investors are told to diversify, which requires breaking stocks into groups. It's a good way to invest, but sometimes you need to think about things just a little differently.This is why investors examining restaurant company Cava (CAVA 0.14%) might want to also consider Realty Income (O 0.10%), a real estate investment trust (REIT). Here's a look at why these two seemingly different stocks could fulfill the same purpose.What does Cava do versus what Realty Income does?Cava operates Mediterranean-themed fas ...