This low blood glucose level can cause light-headedness, fatigue, and hunger. In response to glucose deficient blood, the alpha cells of the pancreatic islets will produce and secrete the hormone glucagon. Once glucagon levels rise in the bloodstream glucagon will diffuse out of the blood and bind to cell-surface receptors in the liver, triggering the conversion of glycogen to glucose in liver cells. The stored glucose is released back into the bloodstream until homeostasis has been achieved. Turn back the clock, what would happen if you ate an apple, a handful of pistachios, or some popcorn instead of a liter soda? The consumption of complex carbohydrates instead of simple sugars, like the ones found in the soda, results in a lower spike in blood glucose. Complex carbohydrate, like those found in healthier snacks, take longer to digest so glucose in slower to enter the bloodstream. Homeostasis of blood glucose levels is more easily maintained because the drastic changes to glucose concentration are disminished, without feelings of hunger or fatigue. The hunger experienced during bouts of low blood sugar, in addition to disrupting short-term homeostasis, can be a contributing factor to over eating and long-term problems like obesity. Glucose is also taken up by adipose cells during the spike in blood glucose and can be converted into fat. This along with exaggerated portion size, sedentary lifestyle, and poor nutritional choices are contributors to the world wind obesity epidemic. By consuming more calories from natural sources containing complex carbohydrates, your body can maintain homeostasis of blood glucose levels more effectively. This can reduce your risk of gaining weight and improve your overall health. It can even help you keep focused while studying for that important biology exam.