Consumption of quercetin and kaempferol in free-living subjects eating a variety of diets

doi:10.1016/S0304-3835(97)04645-4

Cancer Letters

Volume 114, Issues 1–2, 19 March 1997, Pages 141-144

https://doi.org/10.1016/S0304-3835(97)04645-4 Get rights and content

Abstract

Quercetin and related flavonoids are anticarcinogenic in rats, but little is known about human intakes. The intake of five major flavonols and flavones was calculated using 1-day dietary records of 17 volunteers from 14 countries, and using both 3-day records and a food frequency questionnaire of eight Dutch adults. Total consumption (±SD) was 27.6 ± 19.5 mg/day in the international subjects, 34.1 ± 31.2 mg/day in the Dutch adults according to 3-day records, and 41.9 ± 23.7 mg/day according to questionnaires. Quercetin contributed 68–73%, and kaempferol 22–29%, the major sources being tea and onions. A brief food frequency questionnaire may be a suitable method for ranking individuals by flavonol intake.

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Consumption of quercetin and kaempferol in free-living subjects eating a variety of diets

Abstract

Lancet

Am. J. Clin. Nutr.

Flavonol and flavone content of vegetables and fruit

J. Agric. Food Chem.

Flavonol and flavone content of beverages

J. Agric. Food Chem.

Phenolic compounds in foods and cancer prevention