According to research carried out by the Departments of Clinical Biochemistry and Cardiology in Denmark, yellow marks on the eyelids are a sign of increased risk of heart attack.
(These markings, called xanthelasmata, are mostly made up of cholesterol and can be treated cosmetically, but are also a warning sign of raised cholesterol, which can lead to cardiac problems. Guess what I did when I read this? Yup. I went to look in the mirror – so far – all clear.)