Why People with Diabetes Mellitus Have Sweet Taste in Mouth

Many patients with Diabetes Mellitus may be annoyed with the sweet taste in mouth after waking in the morning or a meal. They try every method to eliminate the troublesome taste such as drinking a large amount of water, but it is no useful at all. So, what is the cause of this problem? Is it related to other diseases?

Actually, sweet tastes in mouth mainly attribute to two causes.

1. Digestive system disorder

Many patients with Diabetes Mellitus are usually companied by digestive system disorder which can cause more ptyalin to be secreted. Ptyalin is responsible for converting starch in foods into maltose. When the ptyalin is high, the starch will be converted into maltose at a very fast speed. As the maltose tastes sweet, the patients will feel sweet in mouth. Under this condition, the patients usually feel thirsty and may have constipation and poor appetite and fatigue etc.

2. High blood glucose level

The amount of glucose in spittle rises up with the increasing of blood glucose level. Therefore, if the blood glucose level is high, it is very likely to cause sweet tastes in mouth.

3. Some medicines they take may also cause sweet taste in mouth. Some medicines can affect the taste sense and smell sense directly and some can reduce the secretion of spittle thus providing a favorable environment for the breeding of germ in mouth thus resulting in bad smell in mouth.


The above are the common causes of bad tastes and smell in patients with Diabetes. If you are troubled by other problems such as blurred vision, fluctuating blood glucose level etc, you can consult our experts to get relative professional suggestions.