Urinary isoflavonoid and lignan excretion on a Western diet: relation to soy, vegetable, and fruit intake.

:Dietary isoflavone and lignan phytoestrogens are potential chemopreventive agents. This has led to a need to monitor exposure to these compounds in human populations and to determine which components of a mixed diet contribute to the exposure. Typically, urinary isoflavonoid excretion is associated with soy consumption and that of lignans is associated with whole grains. However, other plant foods are known to contain phytoestrogen precursors. The purpose of this study was to examine the association between urinary isoflavonoid and lignan excretion and intakes of vegetables and fruits (V&F). Isoflavonoids (genistein, daidzein, O-desmethylangolensin, and equol) and lignans (enterolactone, enterodiol, and matairesinol) were measured in urine collected for 3 days from 49 male and 49 female volunteers (age, 18-37 years) reporting a wide range of habitual V&F intakes. Dietary intakes were assessed using 5-day diet records and a food frequency questionnaire. V&F groupings (total V&F, total V, total F, soyfoods, and V&F grouped by botanical families) were used to assess the relationship between V&F intake and urinary isoflavonoid and lignan excretion. Pearson correlations were performed. Intake of soyfoods was correlated significantly with urinary genistein (r = 0.40; P = 0.0001), O-desmethylangolensin (r = 0.37; P = 0.0002), daidzein (r = 034; P = 0.0007), and the sum of isoflavonoids (r = 0.39; P = 0.0001). There was no association between equol excretion and soy intake or between the isoflavonoids and any other V&F groupings. In addition, isoflavonoid excretion was correlated positively with intake of high-fat and processed meats, particularly among men who did not consume soy. This suggests that, even in the United States, on a Western diet, soyfoods are the primary contributors to isoflavone intake; however, additional "hidden sources" of soy may also contribute to exposure. In contrast, a variety of fiber-containing foods contributed to lignan excretion; the sum of the urinary lignans, enterodiol, enterolactone, and matairesinol, was associated with intake of total F (r = 0.27; P = 0.008), total V&F (r = 0.25; P = 0.01), soyfoods (r = 0.28; P = 0.006), and dietary fiber (r = 0.36; P = 0.0003). Overall, urinary phytoestrogens (isoflavonoids + lignans) were significantly higher in "high" compared with "low" V&F consumers. Compared with the "low" V&F group, the "high" group consumed diets that were, on average, higher in fiber and carbohydrate and soyfoods and lower in fat; thus, the urinary phytoestrogens may also be a useful marker of healthier dietary patterns.

Lampe JW ，Gustafson DR ，Hutchins AM ，Martini MC ，Li S ，Wähälä K ，Grandits GA ，Potter JD ，Slavin JL ... -  《CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION》

Vegetables, fruits, and legumes: effect on urinary isoflavonoid phytoestrogen and lignan excretion.

Hutchins AM ，Lampe JW ，Martini MC ，Campbell DR ，Slavin JL ... -  《journal of the american dietetic association》

Urinary isoflavonoid phytoestrogen and lignan excretion after consumption of fermented and unfermented soy products.

Hutchins AM ，Slavin JL ，Lampe JW 《journal of the american dietetic association》

Urinary lignan and isoflavonoid excretion in men and women consuming vegetable and soy diets.

Kirkman LM ，Lampe JW ，Campbell DR ，Martini MC ，Slavin JL ... -  《NUTRITION AND CANCER-AN INTERNATIONAL JOURNAL》

Interindividual variation in metabolism of soy isoflavones and lignans: influence of habitual diet on equol production by the gut microflora.

Rowland IR ，Wiseman H ，Sanders TA ，Adlercreutz H ，Bowey EA ... -  《NUTRITION AND CANCER-AN INTERNATIONAL JOURNAL》