Health Highlights: Feb. 16, 2009

Feb. 17 -- Here are some of the latest health and medical news developments, compiled by editors of HealthDay:

Many Factors Can Contribute to PTSD Risk

Stress hormones, genetics and childhood events are among the factors that could influence a person's risk of developing post-traumatic stress disorder (PTSD), according to research presented at the annual meeting of the American Association for the Advancement of Science.

One study of U.S. military personnel who were exposed to highly stressful situations found differences in stress hormone levels.

"Interestingly, there are some individuals who, when confronted with extreme stress, their hormone profile is rather unique," said Yale University psychiatrist Deane Aikins, Agence France Presse reported. "It doesn't reach the same peak as the rest of us. So we are ready to scream in our chair, and there are certain individuals who just don't get as stressed. Their stress hormones are actually lower and the peptides that down regulate that stress are quite higher."

Low IQ as early as age 5, difficult temperament at age 3, and family factors such as growing up in poverty, having a depressed mother or being separated from parents at a young age could all increase a person's risk of developing PTSD, found Harvard University public health professor Karestan Koenen and colleagues, AFP reported.

Also, "some people have genetic variants that make them more vulnerable to the effects of trauma," Koenen said.

Another study found that Vietnam veterans who suffered injuries in a certain area of the brain didn't develop PTSD.

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Acrylamide May Increase Heart Disease Risk: Study

Acrylamide, a chemical found in foods such as potato chips and french fries, may increase a person's risk of heart disease, according to a Polish study. Previous research has linked acrylamide to nervous system disorders and, possibly, cancer.

Participants in this new study ate large amounts of potato chips for four weeks, resulting in a daily acrylamide intake of 157 micrograms. The volunteers showed negative changes in oxidized low-density lipoprotein ("bad" cholesterol), inflammatory markers and antioxidants. The researchers said these changes could increase the risk of heart disease, United Press International reported.