Abstract
Bias in diet reporting may be both random and non-random, and may be found with simpler as well as more advanced dietary instruments. A random bias will contribute to obscure relations between diet and disease. A systematic bias may obscure or aggravate such associations. Underreporting of non-protein energy has been found to be substantial, particularly among those who are obese or have high dietary intakes. Such a non-random bias on the group level would tend to aggravate associations between dietary non-protein and disease. Whether the net result of the random and non-random bias aggravates or obscures relations depends on the relative magnitude of the two.
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Acknowledgements
The MONICA study was funded by The Danish Medical Research Council. The funding sources had no role in study design, data collection, data analysis, data interpretation or writing of the report.
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Contributors: Idea, writing and research letter manuscript developed jointly between Professor BLH and statistician PF. Statistician CH is thanked for his constructive comments to the paper.
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Heitmann, B., Frederiksen, P. Imprecise methods may both obscure and aggravate a relation between fat and breast cancer. Eur J Clin Nutr 61, 925–927 (2007). https://doi.org/10.1038/sj.ejcn.1602589
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DOI: https://doi.org/10.1038/sj.ejcn.1602589
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