Hi, I have recently started the NHS low calorie diet, it’s total diet replacement with shakes and soups. It’s making me feel awful, I’ve had diarrhoea (sorry), I’m really weak and lightheaded. But the strange thing is is that my blood sugars aren’t reducing. I’ve been on it for 4 days now and I thought I’d see them go down but they haven’t. Does anyone have any experience with this? And know why it might be happening. I’m on literally 800 calories a day in liquid form, it’s hard going.