Matt,
Low carb diets a the biggest myth ever created in the world of diet and nutrition. I have no idea where it's come from - science & cellular biology does not support the ideas! Let me explain...
Carbohydrates in their simplest form are glucose.
We constantly use fat (contrary to popular belief which is we use fat after glycogen). Glucose works in synergy with fat to create energy.
If you take away carbs from the diet, fat will not be able to be used and ultimately, we would die.
There is another place you can get glucose from - protein (either from the diet or muscle tissue breakdown).
We do not just need energy for movement - our heart, brain, kidneys, liver, intestine etc - they are all living cells that require energy to function and this energy comes from stored fat and either stored carbohydrate or protein.
It doesn't make sense not to eat carbs because we need protein for energy and certainly do not want muscles (not exclusive to skeletal muscle) to get smaller.
The trick is to have a little bit of carbs every 2.5-3hrs to ensure efficient energy production, fat burning & muscle retention.
You will hear of people that have tried it and got some good weight loss results...but they are stupid - they have literately sacrificed muscle tissue to fuel a bit of fat loss.
One could lose 5kg on a low carb diet but only 3% body fat...not very good.
I recently took up a bet with a colleague where I just ate carbs, did 0hrs exercise & no protein. He done 4hrs exercise, had only fats and protein and no carbs.
We lost the same amount of fat but my muscle increased by 1kg more than his over a week.
In addition, I felt great where as he felt tired, hungry, lethargic, had bad breath from ketosis & obviously would have put himself at risk of other health issues had it of continued.
He now recommends me to talk to any member for nutrition advice
Hope that helps.