From alcohol abuse to smoking, overeating to lack of exercise, most behaviors that lead to preventable deaths are well-established by adolescence or early adulthood.
But that rate skyrocketed to 46 percent in early adulthood.
White people, in general, were more likely to be healthy as adolescents but experience the biggest decline in healthy behaviors as adults, including high rates of smoking and binge drinking.
"These trends are quite stunning," Harris added.
"Whether or not the trends will continue as they age, we don't know.
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