In order to understand exactly what a person ate within a 24 hour period, the most useful source of data would be:

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Coprolite analysis involves the examination of preserved feces, which can provide direct evidence of the specific foods consumed by individuals or animals within a 24-hour period or over several days, depending on the preservation and context. This method can reveal detailed information about diet, including plant and animal remains, that were ingested.

In Order to Understand Exactly What a Person Ate Within