<Li> Experimental balance studies indicate that urinary riboflavin excretion rates increase slowly with increasing intakes, until intake level approach 1.0 mg / d, when tissue saturation occurs . At higher intakes, the rate of excretion increases dramatically . Once intakes of 2.5 mg / d are reached, excretion becomes approximately equal to the rate of absorption (Horwitt et al., 1950) (18). At such high intake a significant proportion of the riboflavin intake is not absorbed . If urinary riboflavin excretion is <19 μg / g creatinine (without recent riboflavin intake) or <40 μg per day are indicative of deficiency . </Li> <P> Riboflavin is continuously excreted in the urine of healthy individuals, making deficiency relatively common when dietary intake is insufficient . Riboflavin deficiency is usually found together with other nutrient deficiencies, particularly of other water - soluble vitamins . A deficiency of riboflavin can be primary - poor vitamin sources in one's daily diet - or secondary, which may be a result of conditions that affect absorption in the intestine, the body not being able to use the vitamin, or an increase in the excretion of the vitamin from the body . Subclinical deficiency has also been observed in women taking oral contraceptives, in the elderly, in people with eating disorders, chronic alcoholism and in diseases such as HIV, inflammatory bowel disease, diabetes and chronic heart disease . The Celiac Disease Foundation points out that a gluten - free diet may be low in riboflavin (and other nutrients) as enriched wheat flour and wheat foods (bread, pasta, cereals, etc .) is a major dietary contribution to total riboflavin intake . Phototherapy to treat jaundice in infants can cause increased degradation of riboflavin, leading to deficiency if not monitored closely . </P> <P> Treatment involves a diet which includes an adequate amount of riboflavin containing foods . Multi-vitamin and mineral dietary supplements often contain 100% of the Daily Value (1.3 mg) for riboflavin, and can be used by persons concerned about an inadequate diet . Over-the - counter dietary supplements are available in the United States with doses as high as 100 mg, but there is no evidence that these high doses have any additional benefit for healthy people . </P> <P> As a chemical compound, riboflavin is a yellow - orange solid substance with poor solubility in water compared to other B vitamins . Visually, it imparts color to vitamin supplements (and bright yellow color to the urine of persons taking a lot of it). </P>

Which of the following foods would provide the most amount of riboflavin