So, for example, men report height incorrectly (they overestimate), but unless you have enormously different proportions of men in your study groups, it'll even out
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Similarly, people ALWAYS report food intake wrong (we eat more than we think), but since everyone does this almost identically, it doesn't really matter for research purposes
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It's only when the reporting is likely different across study groups that you might have a problem. This is fairly rare
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