SATURDAY, June 19 (HealthDay News) -- A pair of new studies has uncovered evidence that low levels of vitamin D could lead to poor blood sugar control among diabetics and increase the risk of developing metabolic syndrome among seniors.

FRIDAY, June 18 (HealthDay News) -- Only about one-third of cardiac patients were doing regular heart-healthy exercises a year after a heart attack, bypass surgery or angioplasty, researchers have found.

SATURDAY, June 19 (HealthDay News) -- Summer activity-related head injuries appear to be on the rise, warns the American Association of Neurological Surgeons (AANS), and bicycling, water sports and baseball/softball are the main culprits.

SATURDAY, June 19 (HealthDay News) -- For a small number of obese people, those extra pounds do not condemn them to heart disease or diabetes, Dutch researchers report.

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay: