Need A Reason to Quit Coffee? It Decreases Blood Flow to the Brain 20-30%

The claim that coffee decreases blood flow to the brain by 20–30% is rooted in the idea that caffeine, a key component of coffee, can cause vasoconstriction, which is the narrowing of blood vessels. This narrowing can reduce cerebral blood flow temporarily. However, the overall impact of coffee on health is complex and not fully negative.