Tennis Players Ace Perception of Speed, Motion

THURSDAY, June 19 (HealthDay News) -- Tennis players are often faster and more accurate at spotting moving tennis balls on the court, but not necessarily at spotting a cat running across the road while they are driving, according to a new study.

 Scientists ID Enzyme That Allows Dysentery Amoeba to Hide

THURSDAY, June 19 (HealthDay News) U.S. researchers say they've identified an enzyme that may help dysentery-causing amoeba evade the immune system.

 Health Tip: Reduce Your Risk of Anemia

(HealthDay News) -- Anemia occurs when there aren't enough red blood cells in your blood, or they are deficient in a protein called hemoglobin. This means your red blood cells don't carry enough oxygen to the rest of the body.

 Health Tip: Stretch Marks

(HealthDay News) -- Stretch marks, often the result of rapid stretching of the skin, are most commonly associated with pregnancy.

 Brain's Olfactory Bulb Grows With Sense of Smell

THURSDAY, June 19 (HealthDay News) -- The olfactory bulb in the brain -- the brain's "smell center" -- may change in size as a person's sense of smell changes, a German study reports.

 Overtime Work Tied to Anxiety, Depression

THURSDAY, June 19 (HealthDay News) -- Working overtime puts you at a higher risk for developing anxiety and depression, a new study suggests.

 Traffic Pollution Puts Kids at Higher Allergy Risk

THURSDAY, June 19 (HealthDay News) -- A child's risk of developing allergies increases by up to 50 percent from pollution caused by traffic, a rate that increases the closer the child grows up next to major roads, a new study says.

 Star-Shaped Brain Cells Make Scans Possible

THURSDAY, June 19 (HealthDay News) -- Star-shaped brain cells called astrocytes play a key role in allowing experts to see the many reds, oranges, yellows and blues on brain scans, according to a report by researchers at the Massachusetts Institute of Technology.

 Autoimmune Disease Treatment May Not Dampen Immune System

THURSDAY, June 19 (HealthDay News) -- Researchers have uncovered cellular proteins that may be key to certain autoimmune and inflammatory diseases, according to a new study.

 Vitamin D May Promote Colon Cancer Survival

THURSDAY, June 19 (HealthDay News) -- Colon cancer patients with high blood levels of vitamin D boost their survival odds by 48 percent, a new study suggests.

 Metabolic Syndrome May Be in the Genes

THURSDAY, June 19 (HealthDay News) -- Your risk of developing metabolic syndrome -- a group of factors linked to heart disease and diabetes -- increases if you have five common gene variations, researchers say.

 Heart Risks Emerging in People With HIV

THURSDAY, June 19 (HealthDay News) -- Drugs that suppress HIV are keeping infected individuals alive and relatively healthy for years, even decades. But studies suggest that a new health risk is emerging for these long-term survivors: increased odds for heart attack and stroke.

 Drug Effective Against Heart-Lung Disorder

THURSDAY, June 19 (HealthDay News) -- The drug bosentan reduced clinical decline in patients with early-stage pulmonary arterial hypertension (PAH), Italian researchers report.

 Herpes Suppression May Not Prevent HIV Infection

THURSDAY, June 19 (HealthDay News) -- The herpes drug aciclovir (Zovirax) doesn't reduce the risk of HIV-1 infection in people who have sex with men infected with genital herpes, a U.S. study finds.

 Big, Well-Balanced Breakfast Aids Weight Loss

THURSDAY, June 19 (HealthDay News) -- Starting your day with a large meal packed with both carbohydrates and lean protein, and even a small piece of chocolate, can help lessen cravings and hunger the rest of the day, which can lead to significant weight loss, new research suggests.

 Tainted Tomato Cases Jump to 383 People in 30 States, D.C.

THURSDAY, June 19 (HealthDay News) -- The number of people known to have fallen ill after eating salmonella-tainted tomatoes has now jumped to 383 in 30 states plus the District of Columbia, U.S. health officials announced Wednesday afternoon.

 Clinical Trials Update: June 19, 2008

(HealthDay News) -- Here are the latest clinical trials, courtesy of CenterWatch:

 Worldwide War Deaths Underestimated

THURSDAY, June 19 (HealthDay News) -- Wars around the world have killed three times more people over the past half-century than previously estimated, a new study suggests.

 Health Highlights: June 19, 2008

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

 False Positives in Oral HIV Test Halt Use in NYC

THURSDAY, June 19 (HealthDay News) -- Due to problems with false-positive results, the use of an oral rapid HIV test was recently halted by the New York City Department of Health and Mental Hygiene, which operates 10 sexually transmitted disease walk-in clinics.

 Crop Workers Have Highest Heat-Related Death Rate

THURSDAY, June 19 (HealthDay News) -- Crop workers, most of them foreign-born, have the highest rate of death from heat-related illness, a new U.S. report released Thursday found.