You'll find that the definition of low carbing varies according to who's talking. Some say under 20g, some 50g, 75g, 100g etc. However, really it depends on your body as to how low you need to go.
I find I need some carbs or I can't sleep and, tbh, I don't want to avoid all bread, pasta and, more importantly, cake. So, I try to avoid what I deem unnecessary carbs. Now my appetite has shrunk, limiting bread, potatoes etc means I have more space for the main event (meat, fish and of course veggies) and a little space for a cake occasionally. However, because I'm pear shaped I don't think I'm as sensitive to carbs as some so I have under 150g most days but a couple of low carb days to bring the average down to around 100g. Many would not describe this as low carb.
As we know, fasting is low carb in itself (if you're not eating, you're not having carbs) so it may be that the daily 16:8 fasting I do let's me get away with this carb level.
It'll be interesting to see what level of carbs each of us settles on!