(HealthDay News) -- It's healthy and normal to gain weight during pregnancy -- up to a point.

WEDNESDAY, Oct. 26 (HealthDay News) -- A sibling pair with a puzzling condition that made even walking a short distance an agony; a 20-year-old man with a rare respiratory ailment forcing him to live on a ventilator; a woman with a potentially fatal buildup of a protein in her muscles -- all rare cases that were difficult to diagnose, let alone treat.

WEDNESDAY, Oct. 26 (HealthDay News) -- Moving to the beat of music actually helps you hear the music better, according to a new study.

WEDNESDAY, Oct. 26 (HealthDay News) -- Having a good relationship with their teacher may help reduce aggressive behavior among first-graders and also protect them from other students' aggression, researchers have found.

WEDNESDAY, Oct. 26 (HealthDay News) -- People who feel powerless may choose larger food portions in an attempt to boost their social status, a new study suggests.

WEDNESDAY, Oct. 26 (HealthDay News) -- Birth control pills with newer types of progestogen hormones (drospirenone, desogestrel or gestodene) are more likely than others to cause serious blood clots, a new study confirms.

WEDNESDAY, Oct. 26 (HealthDay News) -- Honorary and ghost authors were involved in 21 percent of articles published in six leading medical journals in 2008, which shows that this type of inappropriate authorship remains a problem, a new study says.

TUESDAY, Oct. 25 (HealthDay News) -- The most widely used flu vaccine in the United States is only about 60 percent effective in healthy adults, new research indicates.

WEDNESDAY, Oct. 26 (HealthDay News) -- In an ongoing effort to fight prescription-drug abuse by adults and teenagers in the United States, the U.S. Drug Enforcement Administration (DEA) has scheduled Saturday, Oct. 29 as another National Prescription Drug Take-Back Day.

TUESDAY, Oct. 25 (HealthDay News) -- The death toll in the listeria outbreak traced to cantaloupes produced at a Colorado farm has reached 28, with another 133 people sickened in 26 states, U.S. officials said late Tuesday.

WEDNESDAY, Oct. 26 (HealthDay News) -- The genes suspected of causing autism, schizophrenia and other mental illnesses are activated in the developing brain before birth, according to a major genetic analysis.

WEDNESDAY, Oct. 26 (HealthDay News) -- Using chest X-rays to screen for lung cancer doesn't prevent deaths from the disease, a new study finds.

WEDNESDAY, Oct. 26 (HealthDay News) -- An experimental psoriasis treatment performed significantly better than the commonly prescribed medication methotrexate in a new clinical trial.

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

WEDNESDAY, Oct. 26 (HealthDay News) -- A vaccine to prevent anal cancer is safe and effective for young gay and bisexual males, according to a study funded in part by the vaccine's maker.

WEDNESDAY, Oct. 26 (HealthDay News) -- Overweight people who diet and successfully shed pounds only to gain the weight back again within a year can blame their hunger hormones, new research suggests.