It would cause Cardiogenic Shock. A more percise diagnosis for this though would be Cardiac Tamponade. Hope this helps :)
The glycemic index (GI) is a number associated with a specifix food that represents the food's effect on an individual's blood glucose level. The blood sugar should be kept constant so that the body can perform well. The glycemic index helps you track your blood sugar.
Cardio could easily retain to the areas where the most fat builds up, such as the on the abdomen or the glutes.