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High cassava production and low dietary cyanide exposure in mid-west Nigeria
- Onabolu, A (author)
- Bokanga, M (author)
- Tylleskar, T (author)
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- 2007-01-02
- 2001
- English.
- In: Public health nutrition. - : Cambridge University Press (CUP). - 1368-9800 .- 1475-2727. ; 4:1, s. 3-9
- Journal article (peer-reviewed)
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- Objective:To investigate if high cassava production levels indicate high consumption and high dietary cyanide exposure in three villages situated within the area of Nigeria with higher cassava production than predicted by a geographic model for cassava production in Africa.Design:Exploratory assessment of: cassava production and processing by qualitative research methods and quantification of residual cyanogens in products; cassava consumption by food frequency and weighed food records and dietary cyanide exposure by urinary thiocyanate and linamarin.Setting:Rural communities of Afuze, Ebue and Ofabo in mid-west Nigeria.Subjects:110 subjects from 42 households in three villages for food frequency interviews; 118 subjects in nine Ofabo households for weighed food records.Results:Cassava cultivation was reported to have increased in the preceding 20 years. It was consumed daily by 37 (88%) households, but its mean contribution to daily energy intake was only 13% (SD = 10). The range of residual cyanogens in cassava foods was 0 to 62 mg HCN equivalent/kg dry weight (dw). Ten samples (19%) had levels above the 10 mg HCN equivalent/kg dw FAO/WHO safety limit. Mean urinary thiocyanate and linamarin were 51 (SD = 35) and 20 (SD = 11) μmol/L, indicating low cyanogen intake and dietary cyanide exposure.Conclusion:High cassava production levels did not result in high consumption and high dietary cyanide exposure levels, therefore cassava production levels cannot be used to predict consumption or cyanide exposure levels in the study area. A large part of the production is explained by intensive sales.
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