Sleep loss isn't a major cause, but it still matters. “Sleep loss itself leads people to expend more energy because the body needs more of it to stay awake.” Keeping your body awake longer than it should is very harmful, in more ways than one. When you are awake, you feel compelled to satisfy your hunger or thirst needs. With all that excess food and/or drink and not burning it, it actually turns into fat faster than normal, causing weight gain. In a study conducted by Kenneth Wright, he states, “Also, when people didn't get enough sleep, they ate smaller breakfasts because their bodies thought they should still be sleeping” (“Koebler”). Breakfast, despite what you think, is actually the most important meal of the day. It's what gives you the energy to get through the day, and without it, it may be difficult to stay awake and be active. Additionally, sleep deprivation for just one week leads people to overeat, which without exercise leads to weight gain. Sleeping not only gives your body a chance to rest, but it actually helps burn calories. “Lack of energy balance very often causes obesity. Energy balance means that your IN energy is equal to your OUT energy” (“What”). A deficiency in the sleep department means that your energy IN is not the same as your energy OUT, because less sleep means more food and drink intake and less energy because you lose sleep. Today's teenagers think it's great to stay up all hours of the night, but in reality, people harm themselves in many ways. Not sleeping enough is already not good for you due to lack of energy. From there on things only get worse. The more sleep you deprive your body of, the more damage you do. “Poor contribution to sleep… half of the paper… yes.” News from the United States. US News & World Report, March 11, 2013. Web. December 3, 2013. Neporent, Liz. “8 Surprising Effects of Obesity.” ABC News. ABC News Network, September 14, 2013. Web. January 16, 2014. “Coalition for Action on Obesity > Obesity and Depression.” Obesity Action Coalition Comments on obesity and depression. Np, nd Web. 04 February 2014. Mayo Clinic Staff. "Definition." Mayo Clinic. Mayo Foundation for Medical Education and Research, May 4, 2012. Web. November 30, 2013. “The Risks of Not Exercising.” BBC News. BBC. Nd Web. January 15, 2014. US Department of Health and Human Services. “Dietary Guidelines for Americans.” FDA.gov. U.S. Department of Agriculture., 2005. Web. 08 December 2013. “What Causes Overweight and Obesity?” –NHLBI, NIH. Np, nd Web. November 30, 2013.Wiley-Blackwell. “Obesity and depression may be linked.” ScienceDaily. ScienceDaily, 06 June. 2008. Network. 04 February. 2014.