Diabetes is a condition that is caused by an abundance of glucose in the blood which comes as a result of insufficient insulin (insulin being a hormone that causes the cells in the liver, muscle and fat tissue to take up glucose in order to convert into ATP to be used as energy). In type one diabetes this is due to a failure in the pancreas to produce the hormone (after the pancreas is damaged by the body’s own immune system), while in type two it is caused by the body’s failure to respond to the insulin. This excessive glucose then leads to further complications such as excessive urination and thirst, nerve damage (which presents itself as tingling in the extremities), vision problems, tiredness and more.