It’s an almost planet-wide habit to have a coffee as soon as we get up … without waiting for our stomachs to break their nighttime fast with something more solid. Following the recent discovery of coffee’s beneficial effects (when consumed in moderation) on diabetes, the heart, and some degenerative diseases, is the black beverage concealing its true dark side? Once again, science has come to the rescue of the most faithful companion of those who serve it (as we’ve never seen an American TV movie where scientists drink tea …)
https://www.healthline.com/nutrition/coffee-on-empty-stomach