This definitely depends on the person. An ectomorph has no business performing heavy cardio while being in a large caloric deficit. Endomorphs, however, could b

This definitely depends on the person. An ectomorph has no business performing heavy cardio while being in a large caloric deficit. Endomorphs, however, could benefit from it. I myself have tried fasted cardio in the morning - it produced great results but my brain could not function as it normally does. I found myself making far more stupid mistakes throughout the day. TL;DR - it depends on the person. That is why there is no and never will be a definite answer