About carbs..
Your body will convert carbs to energy and function on those if they are there before it will dip into its own fat stores.
Yes, people on weight watchers and slimming world eat loads if carbs and still lose weight.... at half a pound or a pound a week. At that rate, taking into consideration the stay the same weeks and the odd up a pound weeks, it can take 3-6 months to lose a stone!
And frankly if we were all capable of losing weight and keeping it off on a programme like weight watchers we wouldnt need WLS!
So, when you restrict carbs your body uses more of your own body fat for fuel. You lose more weight faster.
ALSO because you are eating so little we need to be eating protein rich founds - high carb foods tend to be very low protein so not nutrionally of good value for WSL folk. On the other hand high poritein foods are mostly low carb.
There are plenty of healthy low carb veggies, and things like strawberries are a low carb fruit option.
Carbs will also make you hungry and give you cavings. They are the main culprit in food addiction and over eating.