We now know that fat does not cause heart disease. So where does the sugar connection come in?
It all comes down to insulin, the hormone released when your blood sugar rises. When you have a meal, insulin normally sends a signal to your liver not to release fats into your bloodstream because your body is dealing with fat from the meal.
However, if you are living on that roller coaster of blood sugar swings, too much insulin is being released too often and your liver then ignores the message about not releasing fats and releases triglycerides (stored fats) into your bloodstream. These triglycerides are contained in VLDLs (very low density lipoproteins), which are usually rendered harmless by enzymes in your blood. But the enzymes at that moment are dealing with the fat from your food so the VLDLs can end up forming plaque on your artery walls.
In 2009, the American Heart Association published a scientific statement in their journal Circulation entitled ‘Dietary sugar intake and cardiovascular health’ in which they expressed concern that sugar and refined carbohydrates can increase triglycerides (a known risk factor for heart disease) while lowering levels of HDL (‘good’ cholesterol’).