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.

SUNDAY, June 20 (HealthDay News) -- Among older men, having a high testosterone level is associated with a raised risk of heart disease or a heart attack, new research suggests.

SUNDAY, June 20 (HealthDay News) -- Children exposed early in life to polychlorinated biphenyls (PCBs) may have a reduced immune response to tetanus and diphtheria vaccines, a new study indicates.

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.

SUNDAY, June 20 (HealthDay News) -- New research suggests that the ubiquitous sugar known as fructose may cause certain fat cells in children to multiply faster, which might play a key role in childhood and adult obesity.