Why most Nigerians are ageing prematurely, by researchers

Old-Black-ManOld-person‘How poverty, perceived hardship affect cognitive function, others’

A new study has provided an explanation on why many Nigerians are ageing prematurely.The study which also explains the poor intelligent quotient of the population found strong associations between sustained exposure to economic hardship and worse cognitive function in relatively young individuals.

Researchers in the study published in the American Journal of Preventive Medicine found that poverty and perceived hardship over decades among relatively young people in the United States (U.S.), as also the case in many parts of Nigeria, are strongly associated with worse cognitive function and may be important contributors to premature aging among disadvantaged populations.

According to a recent Associated Press (AP) survey, rising income inequality in the U.S. means that four out of five Americans will live near poverty at least once in their lives.

Previous research had shown that exposure to poor socio-economic conditions during childhood, adulthood, or cumulatively, is associated with cognitive deficits. However, most of these studies involved older adults and so there is little data on whether economic adversity influences cognitive health much earlier in a person’s life.

Lead investigator Dr. Adina Zeki Al Hazzouri, of the Division of Epidemiology, Department of Public Health Sciences at the University of Miami, U.S., said: “Income is dynamic and individuals are likely to experience income changes and mobility especially between young adulthood and midlife.

“Monitoring changes in income and financial difficulty over an extended period of time and how these influence cognitive health is of great public health interest.”

Al Hazzouri and her colleagues examined the effects of sustained poverty and perceived financial difficulty on cognitive function in midlife using income data for about 3,400 adults who took part in the ongoing Coronary Artery Risk Development in Young Adults (CARDIA) prospective cohort study. The CARDIA study included black and white males and females 18 to 30 years of age at the start of the study in 1985-86.

Income data were collected from study participants six times between 1985 and 2010. Sustained poverty was defined as the percentage of time the participants’ household income was less than 200 per cent of the federal poverty level. Participants were divided into four groups: never in poverty; less than one third of the time; from one third to nearly 100 per cent of the time; or always in poverty. The annual income cut-offs for 200 per cent of the federal poverty level for a four-person household were $26,718 in 1990, $28,670 in 1992, $31,138 in 1995, $35,206 in 2000, $39,942 in 2005, and $44,630 in 2010.

In 2010, at a mean age of 50 years, participants underwent three tests that are widely used and considered reliable to detect cognitive aging. The Rey Auditory-Verbal Learning Test measures verbal memory and assesses the ability to memorise and retrieve words. The Digit Symbol Substitution Test is a subtest of the Wechsler Adult Intelligence Scale and measures performance on speed domains. The interference score on the Stroop test (executive skills) measures the additional amount of processing needed to respond to one stimulus while suppressing another.

The study found strong and graded associations between greater exposure to economic hardship and worse cognitive function, processing speed in particular, leading investigators to conclude that poverty and perceived hardship may be important contributors to cognitive aging. Individuals with all-time poverty performed significantly worse than individuals never in poverty. Similar results were observed in persons with perceived financial difficulty.

In this article:
Dr. Adina Zeki Al Hazzouri
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  • Basil Ogbanufe


  • Humble Zayon


    • Clement Chukwudifu

      In Nigeria, we have the social system that supports persons in their communities unlike what might be the case in the US. Our community support system in Nigeria does not allow so much of the suffering associated with poverty as we care for one another.

  • Alao Moses

    There’s more than 50% chance that they worked to the answer. We already knew that exclusive breastfeeding and childhood nutrition affect brain development and cognitive functions.

  • Maigari

    Somehow there seems to be nothing “Nigerian” about this opinion the Headline not withstanding. Both the research and the researchers are from the US and surely there are tremendous differences -even in poverty- between Nigeria and the US. For one we in Nigeria do not seem to keep any reliable records and the government operates in very opaque terms given that even mundane information about incomes paid to and received by political ‘public officers’ is unconfirmed. Take the pay of the NASS elected members it ranges from their claimed less than a million Naira/month to the colossal 25 – 50 million Naira a months!
    Yes poverty is a debilitating reality nut what is the definition of ‘poverty’ on Nogerian officialdom’s dictionary?

  • Efeturi Ojakaminor

    “… as also the case in many parts of Nigeria.” They missed it by a mile. This is purely working towards the answer. Just throw it there and the world will believe it. This is not to deny that there is poverty in Nigeria. But I am not impressed.

  • godwyns

    That poverty is common in Nigeria is undeniable. But to push such frivolous headline under an unrelated research is stupid and could lead to wrong belief albeit wrong diagnosis for the issue. If researched in Nigeria – although that would be difficult considering Nigeria lacks records of any kind on social issues – the case would be totally different from the USA’s and possibly too, more grave. Regardless of the communal system of support in Nigeria, emotional burdens and physical poverty is not solved through that, but even if tackled, dignity isnt. In comparison to the USA, Nigeria lacks a social welfare system too. Guardian Nigeria, show a bit more responsibility in reporting real issues; stop misleading!