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Defining food components as new nutrients

S Hendrich1, K W Lee, X Xu

  • 1Food Science & Human Nutrition, Iowa State University, Ames 50011.

The Journal of Nutrition
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

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Certain food components like isoflavones, tocotrienols, and carotenoids show potential as nutrients. Further research is needed to confirm their health benefits and classify them as essential nutrients for humans.

Area of Science:

  • Nutritional Science
  • Biochemistry

Background:

  • Nutrients sustain physiological functions and prevent diseases.
  • Isoflavones, tocotrienols, and carotenoids are candidate nutrients with potential health benefits, including cancer prevention and reduced atherosclerosis risk.

Purpose of the Study:

  • To evaluate the criteria for classifying isoflavones, tocotrienols, and carotenoids as nutrients.
  • To assess the bioavailability and human health-protective efficacy of these candidate nutrients.

Main Methods:

  • Development of a carotenoid database.
  • Analysis of isoflavone content in soy foods.
  • Human bioavailability studies, including urine and fecal excretion analysis.
  • Comparison of bioavailability between major soy isoflavones (genistein and daidzein).

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Main Results:

  • Isoflavone content varies in soy products (0.1-2.5 mg/g).
  • Human bioavailability studies show isoflavones are cleared within 24 hours, with 15-20% recovered in urine and feces.
  • Daidzein exhibits greater urinary excretion compared to genistein, indicating differential bioavailability.

Conclusions:

  • Isoflavones, tocotrienols, and carotenoids meet preliminary criteria for nutrient classification.
  • Long-term human feeding trials are essential to prove health-protective efficacy before definitive nutrient classification.