What is an active site and what is its relationship to an enzyme? an active site in an enzyme is the area that breaks the bond in its substrate. E.g. a maltose molecule's glycocide bond is broken by the active site in a maltase enzyme.
The caffeine in a cup of coffee might help your small blood vessels work better. Credit: Â© jogyx / Fotolia. The caffeine in a cup of coffee might help your small blood vessels work better, according to research presented at the American Heart Association's Scientific Sessions 2013.
Coffee floods nutrients out of your body via the urine. This includes Vitamins A, D, E, K and essential fatty acids. This diuretic effect which is created when drinking coffee can also interfere with your absorption of iron simply because so many nutrients pass so quickly through the kidneys.