“Does caffeine affect blood sugar?”

https://www.mayoclinic.org/diseases-conditions/type-2-diabetes/expert-answers/blood-sugar/faq-20057941#:~:text=Advertisement&text=Some%20studies%20suggest%20that%20drinking,or%20lower%20blood%20sugar%20levels.

This is a hard ? to answer since there are few good studies & they often contradict each other. In my own experience, I have experienced low blood sugar after I drank coffee & at the same time ate a sweet such as a donut. When I became a diabetic 28 yrs. ago that problem stopped & I could drink coffee with a sweet or without & there was no effect on my blood sugar. I think it is important that you not put a lot of sugar in the coffee. If you do and are not diabetic, the combination may overstimulate insulin secretion & the BS will get low. If you are diabetic, the coffee will do nothing but the sugar in it will elevate your blood sugar. Experiment a little & record the effects & follow the course of least symptoms. By the way, there some studies now that have shown that 4 cups of coffee a day in women (but not in men) will slow the development of heart disease. Remember though that caffeine is a potent stimulator of constriction of the blood vessels and thus high blood pressure. So be moderate in intake. Don't over do it!!!