I went to a breatharian initiation last year. Cannot confirm whether there are, in fact people who live without a caloric intake. I did not myself become such a person but my creativity increased relatively permanently  and my sleep quota decreased. The process also triggered kundalini activity.  I had paranormal experiences and awakenings for a couple weeks after My initiation was 9 days, with 3 1/2 days of dry fasting. In a group setting.  I only was able to complete 2 2/3 ish days of dry fasting. It was a lot more difficult than I thought it would be, likely had to do with kundalini.  http://www.theswitchmovement.com/how-to-become-breatharian/