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Federal health officials recommend that preschoolers with attention deficit hyperactivity disorder receive psychological counseling before they are put on medication. But states striving to promote the use of behavioral therapy have been hamstrung by a shortage of mental health providers. (Ollove, 5/12)

Atrial fibrillation, also known as A-fib, can cause blood clots to form in a tiny pouch in the heart. If a clot migrates out into the bloodstream, it could become lodged in a vessel and cut off blood flow to the brain. (Maher, 5/12)

After a meal, your blood sugar tends to rise. When it does, there are cells in your pancreas called beta cells that react by releasing insulin, which controls blood sugar. People who have Type 1 diabetes have damaged beta cells and can't produce insulin. To manage the disease, they either have to inject insulin or wear a pump all day. (Chen, 5/12)

Mecklenburg’s health director has proposed a provocative way to improve the health of teenagers: Restricting fast-food restaurants from opening near high schools. Marcus Plescia’s idea, presented to Mecklenburg commissioners Tuesday, is part of an overall plan to improve the health of county residents. It would be coupled with an effort to bring more fresh food and grocery stores to low-income neighborhoods. (Harrison, 5/12)

Soda tax proponents in San Francisco said at a City Hall press conference this morning that they had gathered twice the number of signatures needed to place a penny-per-ounce soda tax on the November ballot. (Aliferis, 5/12)

College football players who received subconcussive blows to the head had measurable changes in vision even though they reported no symptoms, a new study found. The researchers, most of whom were from Temple University, concluded that vision might be a window into “subclinical brain damage and its recovery.” (Burling, 5/12)

A Philadelphia woman with unusually high "good" cholesterol levels was the impetus for a University of Pennsylvania research study published this year. But she did not realize that until after the research was described in a Philadelphia Inquirer article. (Avril, 5/12)

Five clinical trial sites in South Florida are enrolling patients for a new study looking at a potential treatment for Alzheimer's disease. The MINDSET study is testing a drug called RVT-101 that increases the release of more acetylcholine, a chemical critical for cognitive function. Researchers are testing the treatment for people with mild to moderate-stage Alzheimer's when coupled with donepezil, marketed as Aricept, the most common medication for the neurological disorder. (Lade, 5/12)