The driver’s low blood sugar may have been a contributing factor in a head-on collision Thursday that killed two Flowery Branch residents, according to the Georgia State Patrol.

Jonathan Lynn Wood, 36, was driving a 1997 Honda Civic on Atlanta Highway between Gaines Ferry and Frazer roads at about noon Thursday when his vehicle crossed the center line into oncoming traffic, according to the state patrol.

Wood collided with a 2002 Honda Accord driven by 71-year-old Mary Ann Thompson, also of Flowery Branch, according to the patrol. Both were killed on impact, the patrol said. The patrol’s preliminary report stated that Wood’s low blood sugar could have been a contributing factor to the wreck.

According to the medical Web site WebMD, symptoms of moderate hypoglycemia, or low blood sugar, vary but can include: confusion; difficulty in thinking; inability to concentrate; blurred vision; dizziness; headache; weakness; lack of energy; poor coordination; fatigue; lethargy or drowsiness. Symptoms of severe hypoglycemia can include seizures or convulsions, loss of consciousness or coma, according to the Web site.

There were no passengers in either car and both wreck victims were wearing their seat belts, according to the state patrol.

Portions of the road were closed for a time during the investigation of the wreck, which remains ongoing.