As a 50ish year diabetic I can attest that rises and falls in blood sugar can be complex and confusing! It is not just about eating and tracking blood sugar results. Has anyone heard of the Dawn Phenomena, the Somogyi Effect, the release of glucagon from the liver …..? All these things and more affect the blood sugar. For those struggling to maintain an even keel there are tools in the toolbox to help. A blood sugar test is not all that useful in the long run. The trend is more important. A continual glucose monitor (CGM) can give 24/7 information. An A1C lab test gives a picture of how blood sugars have been over many weeks. As far as smells are concerned, it is the most primitive of the senses but also one of the last to fail (when we do). Surely it must figure into the regulation of the rest of the system!