(HealthDay News) -- Though the holiday season is joyous for many, it can be depressing for some.

(HealthDay News) -- Cognitive decline may lead to difficulty remembering, communicating or learning new tasks.

TUESDAY, Dec. 6 (HealthDay News) -- Different molecular mechanisms may regulate the aging of the human body and the aging of the reproductive system, new research with worms suggests.

TUESDAY, Dec. 6 (HealthDay News) -- Adults who had a very low birth weight are more likely to have memory and attention problems than those who had a low to normal birth weight, a new study says.

TUESDAY, Dec. 6 (HealthDay News) -- Low levels of vitamin D are much more common in obese children than in those who aren't obese and are associated with insulin resistance, a risk factor for type 2 diabetes, researchers have found.

TUESDAY, Dec. 6 (HealthDay News) -- New research points to two gene-based methods of predicting if and when women with certain breast cancers will experience a tumor recurrence.

TUESDAY, Dec. 6 (HealthDay News) -- Working rotating night shifts may do more than leave you tired; it may also increase your risk of developing type 2 diabetes, new research finds.

TUESDAY, Dec. 6 (HealthDay News)-- Women who get routine mammograms can lower their risk of dying from breast cancer by nearly half, a new Dutch study suggests.

MONDAY, Dec. 5 (HealthDay News) -- Newer antidepressants seem to be about as effective as one another, a new analysis indicates.

TUESDAY, Dec. 6 (HealthDay News) -- As the war against cancer continues, a group representing U.S. oncologists has picked its "Top Five" list of advances in cancer care for 2011.

TUESDAY, Dec. 6 (HealthDay News) -- A gene mutation that helps clear fat from the body has been identified by scientists, but they don't know if people with this mutation have a lower risk of heart disease or other health problems.

TUESDAY, Dec. 6 (HealthDay News) -- Less than one-quarter of American parents with an overweight child remember ever being told by a health care professional that this was the case, a new study says.

TUESDAY, Dec. 6 (HealthDay News) -- Giving steroids to pregnant women at risk for preterm birth as early as 23 weeks during their pregnancy may boost an infant's overall chance of survival and reduce the baby's risk of serious developmental issues, including brain injury, a new study says.

TUESDAY, Dec. 6 (HealthDay News) -- Bed bugs appear to breed with their close relatives, an adaptation that not only ups their "yuck" factor but also enhances the tiny bloodsuckers' ability to thrive, two new studies find.

TUESDAY, Dec. 6 (HealthDay News) -- Teens whose parents drink and drive are much more likely to do so themselves, a new U.S. government study finds.

TUESDAY, Dec. 6 (HealthDay News) -- The American presidency comes with perks, from a very nice house to a handy jet at your disposal, but the job also comes with plenty of stress.

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

TUESDAY, Dec. 6 (HealthDay News) -- U.S. officials on Tuesday said that they are taking action to remove controversial, unapproved and illegally labeled HCG weight loss products from the market.

TUESDAY, Dec. 6 (HealthDay News) -- Men with prostate cancer who are being treated with hormone therapy do not appear to be at increased risk of dying from heart disease, according to a large new review of evidence.

TUESDAY, Dec. 6 (HealthDay News) -- A woman's risk of developing breast cancer appears to rise if she has diabetes or is obese after age 60, a new study indicates.