The day-to-day variation in an individual's nutrient intake is called within-person variation.

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Within-person variation refers to the day-to-day variation in an individual's nutrient intake, which can be influenced by factors such as dietary choices, meal timing, and food availability. This type of variation is distinct from between-person variation, which reflects differences in nutrient intake between individuals.

The Day-To-Day Variation in an Individual's Nutrient Intake Is Called