When you eat foods such as white bread, Soda, pastries, and it spikes your insulin level, your pancreas may make extra insulin in an attempt to regulate the level of sugar in your blood, or blood sugar we call it. The issue with insulin in your blood is that is signals the sebaceous glands on your face to produce or manufacture and secrete sebum which we all know is an oily substance. Bacterium (acne) can then present when we get elevated amounts of sebum; which is what clogs your hair follicles. the lesson here is to watch out for foods that spike your blood sugar. I have some great Acne Products, and A full acne regime . Check them out here