It also means depriving the body of dietary fats.
Your body isn't going to burn body fat if there's enough dietary fat to burn. Yes you'll be a fat burning machine, but you'll first of all burn the fat that comes from your diet and only when and if they're unecessary you'll also burn body fat. Studies have been clear on that, if there's enough fat to cover your energy needs, you won't burn a single gram of body fat even on a ketogenic diet.

Likewise even if you have quite a few carbs in your diet, if the amount of carbs is not enough to cover energy needs, your body will necessarily burn body fat to get the extra energy or unfortunately muscles. We're fortunate to work this way (we store fat regardless of what we eat if there's extra energy we can't consume, and we only use the stored fat when we can't obtain enough food from our diet) otherwise we would have been extincted thousands of years ago.