(HealthDay News) -- Good skin care can help keep it healthy, moisturized and acne-free.

(HealthDay News) -- Teenagers need 8 1/2 to 9 1/4 hours of sleep each night to feel good and perform well at school.

TUESDAY, Jan. 31 (HealthDay News) -- A pre-pregnancy diet high in animal fat increases the risk that moms-to-be will develop gestational diabetes, a new study says.

TUESDAY, Jan. 31 (HealthDay News) -- Many employers in the U.S. hospitality industry may be reluctant to hire people with disabilities due to preconceived ideas that they can't do the work and that they are more expensive to employ than non-disabled workers, a new study contends.

TUESDAY, Jan. 31 (HealthDay News) -- When children are sick, family participation is central to their treatment, says a new policy statement from the American Academy of Pediatrics, which calls for patients, their parents and pediatricians to become partners at every level of care.

TUESDAY, Jan. 31 (HealthDay News) -- Experts comparing three leading prostate cancer therapies find external beam radiation therapy to be more toxic and expensive than either surgery or a more localized form of radiation therapy known as brachytherapy.

TUESDAY, Jan. 31 (HealthDay News) -- Women who are both overweight and smoke during pregnancy could damage their baby's developing heart, a new study warns.

TUESDAY, Jan. 31 (HealthDay News) -- Using stem cells to create liver-like cells for laboratory research may advance efforts to find out why people respond differently to hepatitis C infection, scientists say.

TUESDAY, Jan. 31 (HealthDay News) -- Specific areas of children's brains that are activated by humor have been identified by researchers in a first-of-a-kind study.

TUESDAY, Jan. 31 (HealthDay News) -- Older women who take popular medications to control indigestion and heartburn may put themselves at higher risk for hip fractures, researchers report.

TUESDAY, Jan. 31 (HealthDay News) -- A new Swiss-American study indicates that long-term use of the popular diabetes medication metformin may lower the risk of developing pancreatic cancer, at least among women.

TUESDAY, Jan. 31 (HealthDay News) -- Physicians can boost their chances of finding signs of colorectal cancer in patients with a second flexible sigmoidoscopy test, which is a less invasive procedure than a colonoscopy, a new study shows.

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

TUESDAY, Jan. 31 (HealthDay News) -- Testosterone makes people more self-centered and less cooperative, a finding that may explain why group decisions can be affected by dominant individuals, researchers report.

TUESDAY, Jan. 31 (HealthDay News) -- Concerns that research into a genetically mutated form of bird flu could escape from labs or fall into the hands of bioterrorists led U.S. scientific advisers to ask two prominent journals to withhold key details of the groundbreaking research, the advisers explained Tuesday.

TUESDAY, Jan. 31 (HealthDay News) -- Kalydeco (ivacaftor) has been approved by the U.S. Food and Drug Administration to treat the root cause of a rare form of the inherited disease cystic fibrosis.

TUESDAY, Jan. 31 (HealthDay News) -- Vigorous exercise causes changes in some 180 prostate genes among men with early stage prostate cancer, a new study suggests.

TUESDAY, Jan. 31 (HealthDay News) -- Almost one-fourth of women who opt for breast-conserving surgery instead of mastectomy as an initial treatment for breast cancer need a second surgery to ensure all of the cancer cells are removed, a new study says.

TUESDAY, Jan. 31 (HealthDay News) -- Kalydeco, the first drug that targets the defective protein behind a rare form of the deadly lung disorder cystic fibrosis, was approved Tuesday by the U.S. Food and Drug Administration.

TUESDAY, Jan. 31 (HealthDay News) -- Two new drugs, taken alone or potentially together, may boost survival for men with advanced prostate cancer, studies suggest.