Validity of a selective recall method for assessing water intake and its relationship with hydration status

T. Uchida, Y. Nakamura, H. Tanaka, S. Nakamura, T. Okamura, H. Watanabe, N. Murayama

Suntory Global Innovation Center Limited, Research Institute, Seika-cho, Soraku-gun, Kyoto, Japan. Tomoki_Uchida@suntory.co.jp

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• Nutrition
• Public Health

OBJECTIVE: We previously established a descriptive dietary record method that accurately quantifies habitual water intake from food and beverages, to ascertain the relationship between water intake and health. Here, we verified the validity of a selective recall method, which is easy for users to answer and analyze.

PATIENTS AND METHODS: Japanese men and women aged 20-44 years (n = 16) and 45-64 years (n = 16) participated over three working days and one non-working day. The day following each of the surveyed days, participants collected their first morning urine for urinalysis and completed a selective recall and descriptive dietary record questionnaire.

RESULTS: The two methods of determining water intake were positively correlated (r = 0.94, p < 0.0001). Water intake volumes from non-alcoholic beverages (r = 0.94, p < 0.0001), alcoholic beverages (r = 1.00, p < 0.0001), and food (r = 0.72, p < 0.0001), calculated using the two methods, exhibited strong correlation. No correlation was observed between urinalysis parameters and total water intake. A significant, negative correlation was observed between urine osmolarity and total water intake in men (r = -0.55, p = 0.0011) and women (r = -0.51, p = 0.0032) aged 20-44 years.

CONCLUSIONS: Selective recall is a valid method for assessing water intake from food and beverages.

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