How does high blood sugar (hyperglycemia) feel? To maintain the right amount of blood sugar, the body needs insulin, a hormone that delivers this sugar to the cells. When insulin is lacking, blood sugar builds up. We describe symptoms of high blood sugar, including fatigue, weight loss, and frequent urination. Learn who is at risk and when to see a doctor here. Read now

Darkes said several medical professionals worked with him when he was in St. Louis, but he could name only his senior consultant, Dr. Michael Berk. Berk is an endocrinologist who runs his own practice in St. Louis and is also a clinical associate at Washington University. Because Darkes declined a request to submit a medical release form to Berk's office, Live Science could not confirm key elements of his story, or whether or not he was even a patient of Dr. Berk. 
Family or personal history. Your risk increases if you have prediabetes — a precursor to type 2 diabetes — or if a close family member, such as a parent or sibling, has type 2 diabetes. You're also at greater risk if you had gestational diabetes during a previous pregnancy, if you delivered a very large baby or if you had an unexplained stillbirth.
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