I have had Pre-diabetes for several years. I can't seem to change this diagnosis from the GP. I have never been overweight and have always exercised. I am largely on a keto diet. Will get blood glucose peek in the morning after breakfast and less so after lunch and supper. My blood glucose level goes up when I play tennis and down when I go for a walk. They drop very low at night. Thinking my blood glucose levels are more affected by adrenaline than diet. If so is the only answer to avoid stress and adrenaline exercise? I realise my case is not the normal. Age 67 years female retired not real worries lucky me!