For a research study I'm planning on conducting, we want to give participants the option of whether to provide information about their nutritional intake either via telephone, in a written diary form, or via online survey. In the case of telephone data, this would need to take the form of a 24 hour recall - whereas in the written forms it could take the form of a food diary. These are different methodologies, but both trying to access the same underlying reality - what the participant what a participant ate or drank over a given 24 hour period. So is this ok? Or if we try to conflate the results of the two methods into a single 'nutritional intake' variable are we introducing some sort of systematic bias or other problem? Is this sort of multi-method nutritional assessment used by anyone else?

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