Don't drink coffee before a fasting blood glucose test.
Caffeine is quickly absorbed into the bloodstream and your glucose levels could change in response to even black coffee.
The best, most accurate results come from complete fasting, according to Duke Medicine Health News.

Allyson Good curates senior living, health, and family content. She is formerly the Managing Editor of Active Life, a print newspaper published in 2016-2017 for seniors, choosing practical articles on health, money, safety, and everyday living for older readers. She is also an avid gardener and offers up Garden Hints and Tips on a regular basis.
