Plenty of Class one medical holders take Statins.
Sometimes it;s to actually control cholesterol levels, on other occassions, it's simply a recommended practise (e.g for type 2 diabetics). Either way, as long as the AME knows the reason why and the dosage, you'll have no problem.
Going back to the original question, anyone who has higher than normal cholesterol levels or is prone to higher than normal sugar levels in their blood should be very wary of consuming "fat boys devil food" before having a blood test for the class one. It doesn't matter if its the full English or lots of fruit, theyre both as bad for you with regard to the blood test, bananas are completely out of the question! (very high in sugar).
Try and stick to a sensible diet for a few days before and on the day, a bowl of porridge made with water should see you through, (then go for a fat boys fry up afterwards!).