As a 57 year old, seriously overweight prediabetic, I started on LCHF just over two weeks ago. Managed to get the macros right once my 'Carbs & Cals' book arrived and found I was actually following Keto. Carried on regardless and found towards the back end of the first week the brain fog descended along with the headaches and occasional racy heart. I realised I was lacking electrolytes, so upped the salt on food (even though I really don't like salt) and made sure I was getting plenty of salad leaves and green veg (broccoli, sprouts, cauliflower, etc). To no avail, I added a cup of Bouillon occasionally to see if that helped. Still headachey, especially first thing in the morning. Eventually tried an electrolyte supplement (High 5 Zero Protect) in water every morning, which helped, but the brain fog and heavy head still exists. So, having tried most of the recognised remedies, is there anything else worth trying? Or is this something I'll have to plough through until it resolves itself. I drink around 2 to 3 litres of water a day to keep hydrated and pee virtually every couple of hours, so I don't think I'm dehydrated. Your opinions would be appreciated.