Originally Posted by Epoch
If you're looking to burn fat, it's an excellent idea. If you're endurance training, it's a poor idea
No, it is never a good idea.
When you deprive your body and then do cardio, you'll actually be using energy derived from lean muscle instead of energy from fat. So of course you'll lose weight, but is it the weight you want to lose?
And this isn't to say you need a ton in you, but creating highs and lows in blood sugar levels is not healthy for anybody.