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.
A cup of coffee depletes up to 2 cups of water from the body and reduces kidney filtration. Although there is no substance which is able to completely neutralise the negative effects of coffee, one rule of thumb to help counteract dehydration and kidney irritation is - drink 2 glasses of water to every cup of coffee .