Is it possible to live on the breath and the sun alone? The short answer is not as long as you are a human in the 3d realm. As humans it is not possible for us to maintain a healthy BMI without eating food. We can supplement with breath and sun gazing. Both of these bring prana (life force) into the body. They can’t bring what food does. Minerals, vitamins and the mass to build a body. How can the digestive system be maintained without food? Why do we have teeth?
Here is the link to the story on the couple that supposedly are breatharians.
http://www.usmagazine.com/celebrity-moms/news/breatharian-mom-ate-five-times-during-her-pregnancy-w489034