Hi ya
I started CD 6 weeks ago, and 2 weeks in went to my gym to say that i wanted to re-programme due to the VLCD. The instructor was so negative about CD, but she did say that cardio exercise when on VLCD could cause issues, and i would more than likely pass out, as i was not consuming enough to keep my body going asleep, let alone with exercise! She, as everyone! believed she had my best intentions at heart, but in the end she was concerned that my body would need a quick energy fix when exercising, and would be likely to take from muscles and organs instead of fat when consuming so little calories.
not sure if this helps, needless to say, i haven't been yet but i plan to once i move up to 810.
xx