Easy to prepare and oh-so comforting, a sandwich is the go-to lunch for millions of Americans. Don’t let your midday meal get as stale as week-old gluten-free bread. Pile on the flavor with some wildbrine red beet and cabbage kraut.

Or, more precisely, you are what you eat eats. Here we explore the wild and diverse world of your gut microbiome and its critical role in your total body health—from head to toe.