Yoneyama et al 2008 Dietary intake and urinary excretion of selenium in the Japanese adult population: the INTERMAP Study Japan European Journal of Clinical Nutrition (2008) 62, 1187–1193;
This study examined the relationship between dietary selenium intake and 24-h urinary selenium excretion in Japanese population samples participating in the INTERMAP Study.
Using highly standardized methods, they assessed individual dietary selenium intake from four 24-h dietary recalls and measured urinary selenium excretion in two timed 24-h urine collections in 1145 Japanese participants (574 men and 571 women) ages 40–59 years in four areas of Japan.
The medians of dietary selenium intake were 177.5 g/day in men and 139.8 g/day in women; the medians of 24-h urinary selenium excretion were 127.9 g/day in men and 109.4 g/day in women, that is, urinary excretion was estimated to be 73% of dietary intake in men and 77% in women. Dietary selenium intake was significantly correlated with 24-h urinary selenium excretion (r=0.24 in men, r=0.18 in women; PThey concluded that dietary intake and 24-h urinary excretion of selenium are related in the Japanese adult population.

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