An epidemiological note: self-reports are unreliable for everything, but usually this does not impact study results because groups self-report poorly in the same ways
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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