Possibly lots of work, though.
Someone would have to somehow assign sugar value to everything, preferably in a way that doesn’t require new additions to be screened just for that one single variable that won’t matter in most cases.
This would probably involve somehow grading item’s sugar value based on its material (wheat, junk food, fruit), state of matter (liquid/solid), stim value, nutrition and possibly some other stats.
Also, the blood sugar would probably need to be tied to nutrition somehow. If it dropped as fast as morale, it would be really hard to keep up (for those who want it up) and really easy to keep down (tedious, though). Better yet: tied to nutrition and stamina regeneration (actually regenerated stamina, not 10/turn), so that you could keep it up by sitting down.