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.
European Journal of Clinical Nutrition, 2007, Vol 61, Issue 7, p. 925-7
Bias (Epidemiology); Breast Neoplasms; Diet; Diet Surveys; Dietary Fats; Dietary Proteins; Energy Intake; Female; Humans; Obesity; Self Disclosure; Journal Article; Research Support, Non-U.S. Gov't