My husband is on warfarin for an irregular heart beat and has his blood tested on a regular basis, that is, every six weeks depending on previous results. The therapeutic range is 2.0 - 3.0 with a target of 2.5. For months now, he has been in the 2.2 - 2.5 range but his latest results were 3.1 meaning that his blood was less likely to clot than previously.
He had made no change to his diet except for the addition of chocolate biscuit cake which I had made the week before. My husband of course, likes his food so the chocolate biscuit cake disappeared with alarming speed and all just days before his blood test.
I understand that this cake is the Queen's favourite and that she eats a piece every day which may be one of the reasons that she has lived to the age of 91 in good health.