We use barley in this recipe because it is a whole grain, and therefore contains more fiber than arborio rice usually used for risotto. Fiber contributes to gut health, keeps us "regular", and contributes to lower levels of cholesterol in the body.
The recipe pictured his is yellow, which can be achieved by adding a sprinkle of turmeric to the cooking liquid (or saffron, however this spice tends to be quite expensive). Turmeric is an anti-inflammatory spice.