Here's the reason we don't want kids growing up in poverty:
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No matter how big the toothless smiles, how many toys are packed into the playroom, how perfect the family holiday photo seems, many children experience some kind of stress while they are growing up that one researcher says could stay with them into adulthood.
"If a child has a pervasive sense of adversity in his or her childhood for whatever reason, the brain responds to that kind of hardship by becoming more sensitized to stress," Dr. Rajita Sinha, director of the Yale Stress Center, recently explained to CNN.
The brain becomes hard-wired to react more strongly, she says, making that person more likely to have a greater reaction to stress than people who do not have a similar history.
What childhood stress is so big that is burrows into the brains for decades? Research points to pain, illness, and injury as major stressors for kids. But a child's stress level can increase to "severe" during family conflicts such as divorce, abuse, witnessing violence, financial crisis, the death of a loved one, or a parent who suffers from addiction or mental health problems.
While anxiety is a normal reaction to stress and can even be OK for children to navigate, according to the National Institute of Mental Health, some people experience excessive levels of anxiety. One in eight children are affected by an anxiety disorder, according to the Anxiety Disorders Association of America, including those who are deemed to have post-traumatic stress disorder.
While humans are "adaptive animals," Sinha says many children are experiencing stress before their ability to deal with it is completely developed. The adversity in their young lives therefore leads to a higher overall stress level into adulthood.
"The stress pathway is developing during childhood. The stress system needs time to grow and become fully functional," Sinha says.
Small children under stress are sources of concern, according to her studies. But she also sees adolescents, who are more likely to self-isolate, as particularly vulnerable. Teenagers' stress symptoms may range from sleep difficulty to overeating to school truancy to taking pain medication unnecessarily.
While parents may not be able to completely shield children from stressors -- a kid's home life might be magical but they may encounter a bully in Sunday school or suddenly lose a grandparent to cancer -- Sinha says parents, teachers, and caregivers can help build resistance and optimism when kids experience stress.
Parents can help build resistance - but not if the parents are stressed them selves and/or are the source of the stress for the kid. And overworked teachers with a class full of troubled kids aren't going to be of much help either.