What Happens When Caffeine Enters The Body
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Metabolism IncreasedInsulin is a hormone that allows glucose to actually enter a cell. When the glucose gets transported into a cell, cell respiration can begin. Cell respiration, or metabolism, is the process of converting glucose into ATP (usable energy). Cell respiration has three steps, during which bonds within the glucose molecules are broken by hydrolysis and the energy stored within those bonds is released and made into ATP. When caffeine enters the body and glucose is released by the liver, the body has a higher level of blood sugar. This high level of blood glucose causes the pancreas to release insulin into the bloodstream to bind to the glucose and allow glucose to enter the cell. Then cell respiration can occur as normal. However, with caffeine in the body, there is more glucose and more glucose means more cell respiration (metabolism) can occur. The body is using up more of the glucose stored in the liver to make energy and then using that energy right away. The "energy boost" one feels after drinking caffeine is from the increased ATP production in cell respiration. While caffeine is present in the body (about 4-6 hours after consumption), the body's metabolism is increased as well. According to greatist.com , caffeine can increase the body's metabolic rate by up to 10%.
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