Lots of ultramarathoners implement vlc as a secret weapon to win races. It's not much of a secret anymore as now lots of them are doing it. Not having to eat anything (or very little) during a many hour race, not having to deal with the digestive distress of consuming food while running and not losing any strength or energy even while not eating is a huge benefit in a long distance race. Not all of them do this, of course, and some of the runners who live life low carb in regular life consume simple carbs during the race hoping for an edge in "train low, race high" terms.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting bench press: 30lbs. Current bench press: 77.5lbs.