Nadine Burke Harris – TRANSCRIPT
In the mid-’90s, the CDC and Kaiser Permanente discovered an exposure that dramatically increased the risk for seven out of 10 of the leading causes of death in the United States. In high doses, it affects brain development, the immune system, hormonal systems, and even the way our DNA is read and transcribed.
Folks who are exposed in very high doses have triple the lifetime risk of heart disease and lung cancer and a 20-year difference in life expectancy .And yet, doctors today are not trained in routine screening or treatment. Now, the exposure I’m talking about is not a pesticide or a packaging chemical. It’s childhood trauma. Okay.
What kind of trauma am I talking about here? I’m not talking about failing a test or losing a basketball game. I am talking about threats that are so severe or pervasive that they literally get under our skin and change our physiology: things like abuse or neglect, or growing up with a parent who struggles with mental illness or substance dependence.
Now, for a long time, I viewed these things in the way I was trained to view them, either as a social problem — refer to social services — or as a mental health problem — refer to mental health services. And then something happened to make me rethink my entire approach. When I finished my residency, I wanted to go someplace where I felt really needed, someplace where I could make a difference.
So I came to work for California Pacific Medical Center, one of the best private hospitals in Northern California, and together, we opened a clinic in Bayview-Hunters Point, one of the poorest, most underserved neighborhoods in San Francisco. Now, prior to that point, there had been only one pediatrician in all of Bayview to serve more than 10,000 children, so we hung a shingle, and we were able to provide top-quality care regardless of ability to pay. It was so cool. We targeted the typical health disparities: access to care, immunization rates, asthma hospitalization rates, and we hit all of our numbers. We felt very proud of ourselves.
But then I started noticing a disturbing trend. A lot of kids were being referred to me for ADHD, or Attention Deficit Hyperactivity Disorder, but when I actually did a thorough history and physical, what I found was that for most of my patients, I couldn’t make a diagnosis of ADHD. Most of the kids I was seeing had experienced such severe trauma that it felt like something else was going on. Somehow I was missing something important.
Now, before I did my residency, I did a master’s degree in public health, and one of the things that they teach you in public health school is that if you’re a doctor and you see 100 kids that all drink from the same well, and 98 of them develop diarrhea, you can go ahead and write that prescription for dose after dose after dose of antibiotics, or you can walk over and say, “What the hell is in this well?” So I began reading everything that I could get my hands on about how exposure to adversity affects the developing brains and bodies of children.
And then one day, my colleague walked into my office, and he said, “Dr Burke, have you seen this?” In his hand was a copy of a research study called the Adverse Childhood Experiences Study. That day changed my clinical practice and ultimately my career. The Adverse Childhood Experiences Study is something that everybody needs to know about. It was done by Dr Vince Felitti at Kaiser and Dr Bob Anda at the CDC, and together, they asked 17,500 adults about their history of exposure to what they called “adverse childhood experiences,” or ACEs. Those include physical, emotional, or sexual abuse; physical or emotional neglect; parental mental illness, substance dependence, incarceration; parental separation or divorce; or domestic violence. For every yes, you would get a point on your ACE score. And then what they did was they correlated these ACE scores against health outcomes.
What they found was striking. Two things: Number one, ACEs are incredibly common. Sixty-seven percent of the population had at least one ACE, and 126 percent, one in eight, had four or more ACEs. The second thing that they found was that there was a dose-response relationship between ACEs and health outcomes: the higher your ACE score, the worse your health outcomes.
For a person with an ACE score of four or more, their relative risk of chronic obstructive pulmonary disease was two and a half times that of someone with an ACE score of zero. For hepatitis, it was also two and a half times. For depression, it was four and a half times. For suicidality, it was 12 times. A person with an ACE score of seven or more had triple the lifetime risk of lung cancer and three and a half times the risk of ischemic heart disease, the number one killer in the United States of America.
Well, of course this makes sense. Some people looked at this data and they said, “Come on You have a rough childhood, you’re more likely to drink and smoke and do all these things that are going to ruin your health. This isn’t science. This is just bad behavior.” It turns out this is exactly where the science comes in.
We now understand better than we ever have before how exposure to early adversity affects the developing brains and bodies of children. It affects areas like the nucleus accumbens, the pleasure and reward center of the brain that is implicated in substance dependence. It inhibits the prefrontal cortex, which is necessary for impulse control and executive function, a critical area for learning. And on MRI scans, we see measurable differences in the amygdala, the brain’s fear response center.
So there are real neurologic reasons why folks exposed to high doses of adversity are more likely to engage in high-risk behavior, and that’s important to know. But it turns out that even if you don’t engage in any high-risk behavior, you’re still more likely to develop heart disease or cancer. The reason for this has to do with the hypothalamic–pituitary–adrenal axis, the brain’s and body’s stress response system that governs our fight-or-flight response.
How does it work? Well, imagine you’re walking in the forest and you see a bear. Immediately, your hypothalamus sends a signal to your pituitary, which sends a signal to your adrenal gland that says, “Release stress hormones! Adrenaline! Cortisol!” And so your heart starts to pound, your pupils dilate, your airways open up, and you are ready to either fight that bear or run from the bear.
And that is wonderful if you’re in a forest and there’s a bear. But the problem is what happens when the bear comes home every night, and this system is activated over and over and over again, and it goes from being adaptive, or life-saving, to maladaptive, or health-damaging. Children are especially sensitive to this repeated stress activation, because their brains and bodies are just developing. High doses of adversity not only affect brain structure and function, they affect the developing immune system, developing hormonal systems, and even the way our DNA is read and transcribed.