In fact, fatigue & tired feeling are pretty common in people with hyperglycemia or high blood sugar. Hyperglycemia is a condition when the amount of glucose (a simple form of sugar) in the bloodstream is higher than normal. It may signal that something goes awry with the glucose metabolism in the body.
The performance of your glucose metabolism is closely associated with the fluctuation of your blood sugar. In most healthy people, their blood glucose levels do not fluctuate widely throughout the day.
Typically, your blood glucose reaches its peak level during eating and after meal. And for the lowest level, it usually occurs between meals. If you are fasting for at least 8 hours, your blood sugar also decreases lower.
The fit status of your hormone insulin is very crucial for your glucose metabolism.
Without good performance of insulin, your body cannot convert the glucose to become energy. To get a specific amount of energy, glucose taken from foods need to be absorbed first by cells and muscles of the body from the bloodstream. And insulin has a significant contribution for the mechanism of this absorption.
Your pancreas is the major organ that produces insulin. When your body notices that the level of glucose in the bloodstream is high (e.g. after eating), the brain will send a signal to the pancreas to release insulin into the bloodstream. Insulin helps glucose to be easier to go and enter into the cells and muscles. Then glucose is converted into energy, which is vital to support your activity throughout the day.
Not all glucose is directly converted to become energy. Some may be stored in your liver as glycogen and in your fat cells as ‘fat’. They can be converted again into energy when your body needs.
The symptoms of tired feeling, weakness, and fatigue are usually caused by the lack of energy supply for your body. If you have clearly understood the mechanism of glucose metabolism (as written before), now you should be very easy to understand the correlation between these symptoms and high blood sugar!
High blood sugar may also cause weight loss – if there is poor energy converted from glucose, you’re less likely to have excess energy to be stored as fat in your fat cells.