Is your vision becoming blurry for no apparent reason? High blood sugar can change the shape of the lens and affect vision. If this happens regularly, talk to your doctor.
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Difficulty concentrating
A brain lacking fuel (due to poorly utilized glucose) functions at a slower pace. The result: difficulty concentrating, mental fatigue, and a feeling of being "in a fog" .
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Dry mouth

The sensation of a dry mouth, often accompanied by intense thirst, may indicate that your body is losing too much fluid due to the elimination of sugar through urine.
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Erectile dysfunction (in men)
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