Dietary Polyphenol Intake Estimated by 7-Day Dietary Records among Japanese Male Workers: Evaluation of the Within- and Between-Individual Variation

Abstract

Summary Polyphenol intake has been estimated in some populations; however, information about day-to-day and individual differences in polyphenol intake has not been wellevaluated. In this study, we aimed to examine within-and between-individual variation in polyphenol intake in Japanese male workers. First, 56 male subjects (aged 37.9610.4 y) completed detailed 7-d dietary records (DR). We then calculated their total polyphenol intake using our polyphenol content database and the within-and between-individual variations. We also estimated the minimum number of days of dietary assessment required both to rank individuals within a group and to assess an individual's usual polyphenol intake with acceptable accuracy. The estimated daily total polyphenol intake was 9656471 mg/d, which was largely sourced from beverages. The day-to-day variation (CVw) for polyphenol intake was 43.6%, and the variation between the individuals in the population (CVb) for polyphenol intake was 45.9%. A 4-d DR was required to rank individuals within a group with high correlation coefficients (r50.9), and a 19-d DR was required to assess the individual's usual polyphenol intake with 20% deviation. The CVw for polyphenol intake was intermediate between those of the other nutrients, but the CVb for polyphenol intake was largest among the nutrients. These results suggest that the dietary intake of polyphenols should be carefully estimated considering its within-and between-individual variation.

Dietary intake of total polyphenols and the risk of all-cause and specific-cause mortality in Japanese adults: the Takayama study

“…Our present subjects' polyphenol consumption was largely attributed to coffee and green tea, which is consistent with our previous studies in several Japanese populations [12][13][14][15][16][17]. The main polyphenolic compounds of coffee are hydroxycinnamic acids including chlorogenic acids, whereas green tea contains some flavonoids, mainly catechins.…”

“…The intake patterns of polyphenol vary among countries; Japanese consume polyphenols largely from beverages (approx. 80%), and less from vegetables and fruits (< 10%) according to our studies [13,[15][16][17], whereas not only beverages but also vegetables and fruits contribute to polyphenol intake in some studies conducted in European countries [18][19][20]. In addition, the mortality rates and contributing risk factors for the onset of chronic diseases such as CVD and cancer also vary from country to country.…”

“…Since Japan has a unique food culture, we established an original database for the polyphenol content of foods consumed in Japan to precisely estimate the daily polyphenol intake by Japanese individuals. Using the database, we have estimated the total polyphenol intake in several Japanese populations [12][13][14][15][16][17]. The intake patterns of polyphenol vary among countries; Japanese consume polyphenols largely from beverages (approx.…”

Estimated Dietary Polyphenol Intake and Its Seasonal Variations among Japanese University Students

“…Polyphenols are major compounds present in many plant foods and beverages, such as coffee, teas, vegetables, and fruits (1). We developed an original polyphenol content database and estimated the total polyphenol intake in several Japanese adult populations (2)(3)(4)(5)(6)(7)(8). Based on the findings obtained in those studies, we documented that beverages were a larger source of total polyphenol (approx.…”

Quantities of Phospholipid Molecular Classes in Japanese Meals and Prediction of Their Sources by Multiple Regression Analysis

“…Although contents of functional ingredients, such as PLs or polyphenols, have not been described in the food composition tables, researchers have to sum their contents in foods listed in the literature. In fact, the intake of a food material rich in a specific ingredient, such as in polyphenols (17,18) or flavonoids, has been estimated as one-day or one-meal intake. However, ingredients such as PLs, especially PC, are contained in many types of food material.…”