Howdy @sassy1 x in answer to yr question above...( sorry it's long!)
While it hasn't been exactly a breeze to do it,i HAVE found BSD 800cals/ 50 grams carb do-able for two main reasons..
FIrst being the dawning realisation that giving up simple carbs like bread,rice,potatoes and pasta means i am much less hungry. Once i sent that Carb Monster packing, i no longer experienced that awful eternal hunger/ four pm miserable dip in mood, that i used to put down to greediness,but in fact was just addiction to simple carbs.
Eating simple carbs just means wanting more simple carbs! I was very lucky that i only experienced withdrawal symptoms on day one,then i was fine...which of course made things easier.
Now the only things i really miss are nibbly things like crackers or biccies to dip in my tea!
The other equally important thing was making sure i ate full fat stuff! Ive known this all along, but never was it proved for me so much as a few days ago. Couldnt find full fat Total greek yogurt in the supermarket,so i thought Just this once, i' ll have the low fat stuff. What a mistake! Went to bed hungry that night and woke next day wanting toast.
So i keep in mind the mantra "Full Fat is Filling!"
Total Greek yog is a lifesaver,it really does keep me on this Way of Eating..its delicious with a few berries and a sprinkle of nuts..as nice as any creamy calorific dessert. And at dinnertime what could be nicer than sidedish of veg such as cabbage with lots black pepper and butter? Or a simple quick din dins like buttery scrambled eggs on a bed of spinach?
I' m just finishing week 15 now and intending to keep going til week 24 which takes me to New Year,when i'll probably do 5:2 again but the BSD version which is 800 cals on fast days rather than 500 ( such luxury!

) I still have plenty of chub to lose!
I will always stay low carb, coz i now prefer having a daily choice of what to wear rather than choosing a cake or a handful of biccies to dunk in my cuppa!
I am not complacent tho,i know how easy it is to fall off the wagon..but its much less likely now i know the two secrets to success i didnt know in the past..one,that chasing the Carb Monster works wonders and two,that fullfat food really does keeps me full. AND in addition,eating full fat means you lose fat,strange but true!
As always i am sooooo grateful to @hazelnut20 for posting about her BSD journey..she gave me the incentive to give it a go,at a time when i was truly getting desperate coz nothing in my wardrobe fitted any more.
Things are so different now ..i have given so much away to the charity shop coz too loose/ baggy etc,and other items that have languished unworn coz too small/ unflattering are now in full swing!
So i can only encourage anyone who feels like i did in July to jump in..you may feel apprehensive ( i was ) but it is a lot easier than it sounds. You will be rewarded with big weekly losses and inevitably an occasional plateau but they will pass. And as we always say on Fast Day forum, take note of the inches as well as the lbs. The weight loss from your middle is particularly impressive coz you lose fat stored in the pancreas, which shows up on yr waistline,and totally changes how your shape looks ! X