It can be! You need to drink more anyway when LCHF but if you are feeling thirsty all the time it's probably because you need more sodium, potassium or magnesium. We all pass a lot of these in our urine with ketone and if you are not replacing them your body makes you thirsty as was way of trying to let you know. Drink bone broth, stock/ bouillon cubes, make your own 'mineral' water, supplement magnesium (400mg/day+) take extra salt and add Lo Salt for potassium. I had it for ages and hadn't realised why until I asked here!! All sorted now happily and if I get thirsty I know why!

Your welcome.