Memory of food intake. Retrospective studies of diet and health often rely on recall of distant dietary histories. The validity and reliability of such information is often suspected. An epidemiologic study asked middle-aged adults (median age 50) to recall food intake at ages 6, 18, and 30 years. Recall was validated by comparing recalled results to historical information collected during earlier time periods. Correlations rarely exceeded r = 0.3.s What do you conclude from this result?