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"The focus on black adolescents is significant. In much of this research, white Americans appeared somehow to be immune to the negative health effects that accompany relentless striving."

Poverty in youth, is a predictor of future poor health outcomes. This is the conclusion of so many Dunedin study papers. [0] An unexpected finding, the effects of poverty are ^not^ reversed by future wealth. I can't find the specific study for this, however another report displays another unexpected find, "The high-need/high-cost group of adults could be identified as young as age 3years on the basis of their ‘brain health,’". [1]

While poverty is the root cause, race determines poverty, the health outcomes are lifelong.

Reference

[0] http://dunedinstudy.otago.ac.nz/publications

[1] http://dunedinstudy.otago.ac.nz/news-and-events/article/53