Weight loss and incident dementia in elderly Yoruba Nigerians: A 10-year follow-up study

Adesola Ogunniyi, Su Gao, Frederick W. Unverzagt, Olusegun Baiyewu, Oyewusi Gureje, James Tat Nguyen, Valerie Smith-Gamble, Jill R. Murrell, Ann M. Hake, Kathleen S. Hall, Hugh C. Hendrie

Research output: Contribution to journalArticle

17 Scopus citations


Background: The relationship between weight and dementia risk has not been investigated in populations with relatively low body mass index (BMI) such as the Yoruba. This study set out to achieve this objective using a prospective observational design. Methods: The setting was Idikan Ward in Ibadan City, Nigeria. The participants were all aged 65 years or older and were enrolled in the Indianapolis-Ibadan Dementia Project. Repeated cognitive assessments and clinical evaluations were conducted to identify participants with dementia or MCI during 10 years of follow-up (mean duration: 5.97 years). BMI measures, information on alcohol, smoking history, cancer, hypertension, diabetes, heart attack, stroke and depression were collected at each follow-up evaluation. Mixed effect models adjusted for covariates were used to examine the differences in BMI among participants who developed dementia or MCI and those who remained cognitively normal during the follow-up. Results: This analysis included 1559 participants who had no dementia at their first BMI measurements. There were 136 subjects with incident dementia, 255 with MCI and 1168 with normal cognition by the end of the study. The mean BMI at baseline was higher for female participants (22.31; SD = 4.39) than for male (21.09; SD = 3.61, p < 0.001). A significantly greater decline in BMI was found in those with either incident dementia (p < 0.001) or incident MCI (p < 0.001) compared to normal subjects. Conclusion: Decline in BMI is associated with incident MCI and dementia in elderly Yoruba. This observation calls for close monitoring of weight loss in elderly individuals which may indicate future cognitive impairment for timely detection and tailored interventions.

Original languageEnglish (US)
Pages (from-to)387-394
Number of pages8
JournalInternational Psychogeriatrics
Issue number3
StatePublished - Apr 1 2011


  • body mass index
  • dementia
  • mild cognitive impairment
  • normal cognition

ASJC Scopus subject areas

  • Geriatrics and Gerontology
  • Psychiatry and Mental health
  • Gerontology
  • Clinical Psychology
  • Medicine(all)

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