I take a b-blocker and although I have no studies to back this up, by my experience it does slow my metabolism down. However I'm also no spring chicken so that doesn't help either.
1 Corinthians 16:13
Be on the alert, stand firm in the faith, act like men, be strong.
The man who yields to a particular temptation has not felt its full power. He has given in while the temptation has yet something in reserve. Only the man who does not yield to temptation. . . knows the full extent of that temptation.