When you eat carbs they are turned into glucose. The pancreas then produces insulin to move the glucose into the cells for energy. Whatever carbs aren't immediately needed for energy are stored as glycogen in the liver and muscles so when you need a quick burst of energy , it will be available. Now what are liver dumps. When your body is under stress ( fight or flight), your body produces stress hormones like cortisol, adrenaline which signal liver to convert this stored glycogen into glucose and adds it back to blood stream. Now the tricky part is that our body sometimes interprets stress in a wierd way. Sometimes when you haven't eaten for awhile your body produces these stress hormones. Also in the wee hours of the morning your body produces these hormones and then signals liver to produce glucose to start the wake up process. In a normal non diabetic when they get these liver dumps then their pancreas produces an appropriate amount of insulin to counteract.