Hello. There may be a simple answer to this but I can't think what it is. At 5.18 my blood sugar level was 5.8. I had my breakfast of raspberries and Greek yoghurt 5 mnutes later. I took my bs before lunch at 12.25 and it was 8.2. I had had a coffee but no food . What would cause the levels to rise so much without food? I'm curious. Thank you for taking time to read this.