It increases the blood sugar. You have to make sure your blood sugar is not too low or not too high. If it becomes to high/low your health can become really bad. Yes, diabetes is harmful to your body because it can cause a heart disease, stroke, kidney damage, and nerve damage.
Is this a question about an article or something?
It causes symptoms like thirst, headache, weakness, dizziness and fatigue.
If the level is not over you stress threshold it can push you to do better
Please elaborate if this does not help.
