Type 2 diabetes means that a person's pancreas can not produce enough insulin to regulate the rise in blood sugar levels. Many people do not realize that they are living with the disease because the symptoms do not necessarily make them feel unwell. The sooner the warning signs are recognized, the better – however, early intervention prevents the risk of serious health complications such as heart disease. A warning sign is a prolonged tiredness.
Fatigue can be the result of a number of factors, such as: Stress, hard work or sleep disorders.
The warning signal can therefore be easily discarded.  However, it could also be related to high or low blood sugar levels.
According to Diabetes.co.uk: "Fatigue is the result of an imbalance between your blood sugar level and the amount or effectiveness of circulating insulin.
If a person feels tired during the day, despite having slept well, it may be due to high or low levels of sugar, the health body says.
Blood sugar levels increase when insulin is low or insulin is not effective enough.
"To provide us with energy, insulin is needed to transport glucose from the blood into our cells and use it for energy.
"If there is not enough insulin or insulin does not work effectively, it means that the sugar in our blood can not get into our cells and therefore our cells do not get the energy they need. As a result, we feel tired.
Testing blood sugar levels can tell whether fatigue is actually due to high or low sugar levels.
Persistent fatigue may be a symptom, but sleep deprivation also increases the risk of developing type 2 diabetes.
A study in mice found that the loss of a single night can impair the liver's ability to produce glucose and process insulin and increase the risk of metabolic diseases such as liver steatosis (fatty liver). and type 2 diabetes, according to the results published in the American Journal of Physiology ̵
Sleep deprivation has been associated with more eating, less exercise and a higher risk of Type 2 diabetes. However, a research team from Japan's Toho University Graduate School of Medicine said, "It was not clear if glucose intolerance was due to changes in food intake or energy consumption or sleep deprivation itself."
The researchers studied two groups of mice: One group was kept awake for six hours each night ("sleep deprivation"), while the control group was allowed to sleep at will. Prior to the study, the research team offered both groups an unlimited number of high-fat foods and sugar water that mimicked people's habits. During the sleep / waking phase, the animals had limited opportunities for physical activity.
Immediately after the experimental phase, the researchers measured the glucose level and the fat content of the liver.
Blood glucose levels in the sleep deprivation group were significantly higher than controls after a six hour vigilance session.
Triglyceride levels (fat) and the production of glucose in the liver also increased in the sleep deprivation group after a single wakeful period.
Increased liver triglycerides are associated with insulin resistance or the inability of the body to properly process insulin.
In addition, sleep deprivation altered the expression of enzymes that regulate liver metabolism in the sleep deprivation group.
These results suggest that "intervention studies" were designed to prevent sleep deprivation, liver steatosis and insulin resistance should be performed in the future, "the researchers wrote.